Costello, Brennan, DeVidas, Sasso and Sinclair, P.C.

Our family law practice addresses divorce, child custody, and spousal support matters with sensitivity and legal expertise. We help clients navigate emotionally charged disputes while protecting their rights and children's best interests. Our attorneys employ negotiation strategies to minimize conflict while preparing for potential litigation.

We represent clients injured through others' negligence in auto accidents, slip-and-falls, and workplace incidents. Our attorneys fight for full compensation covering medical expenses, lost wages, and pain and suffering while managing complex insurance negotiations on clients' behalf.

Our probate services guide families through estate administration, will validation, and guardianship proceedings. We help executors fulfill legal obligations while minimizing delays and disputes, providing clear direction during emotionally difficult periods following a loved one's passing.

We defend clients facing misdemeanor and felony charges with strategic representation focused on protecting their futures. Our approach combines early evidence review, constitutional challenge identification, and local courtroom experience to achieve dismissals, reduced charges, or favorable trial outcomes.

We assist injured workers in securing rightful benefits for job-related injuries and illnesses. Our attorneys challenge denied claims while navigating Connecticut's workers' compensation system to ensure clients receive medical treatment coverage and wage replacement benefits without unnecessary delays.

Kieran Costello specializes in family law and criminal defense with over 25 years of courtroom experience. He focuses on protecting clients' rights while providing compassionate guidance through complex legal challenges, particularly in domestic violence cases.

Christopher Brennan handles personal injury and workers' compensation cases, leveraging his trial experience to secure favorable settlements. He specializes in proving liability in complex accident cases while managing clients' medical treatment coordination.

Claire DeVidas focuses on divorce and family law matters, particularly complex financial divisions in high-asset cases. She emphasizes strategic negotiation while maintaining trial readiness to protect clients' interests in contested custody and property disputes.

We specialize in family law, personal injury, probate, criminal defense, workers' compensation, and juvenile law cases throughout Fairfield County.

We prioritize negotiated settlements while preparing for litigation, focusing on child custody, property division, and spousal support with minimal conflict.

Our client-centered approach combines decades of local courtroom experience with personalized attention, avoiding the 'case number' treatment found at larger firms.

Yes, we provide free initial consultations for family law, personal injury, and criminal defense matters to discuss your legal options.

We explain all costs upfront with transparent billing practices, offering various fee arrangements tailored to clients' financial situations and case complexity.

Chris Brennan represented me for a divorce. He guided me through the entire process and kept me informed every step of the way. He protected my rights and I was very happy with the result. I would recommend this great attorney to anyone going through this kind of situation.

Fantastic experience working with Claire and Kieran. They provided extraordinary guidance along the way and always welcomed my questions and thoughts. Incredibly patient but more importantly, they were consummate professionals and highly experienced. They know their stuff and aggressively act on the client's behalf.

I recently had the pleasure of working with Linsey A. DeDomenico, Esq. Linsey took over my case after another attorney abandoned me. From day one she stepped right in, cut through the red tape and challenges, navigated my case as if she had been there from the beginning, kept my case on track, and was a strong advocate for me and my family. She is detail oriented making sure every base is covered.

She is patient and worked hard for a positive outcome. Linsey was able to accomplish in mere months what the other attorney could not/had not accomplished in almost a year. She worked tirelessly and maintained a calm, positive and professional demeanor at all times. Thank you, Lindsey.

I had the immense pleasure of working with Kieran Costello & Sean Plumb throughout my divorce process. Divorce is difficult enough on any individual but both Kieran & Sean couldn't have been more professional, knowledgeable & encouraging throughout the process (Kieran's sense of humor kept my spirits up as well)! They were there by my side & kept me updated every step of the way! The entire staff at this office is wonderful. I would HIGHLY recommend their services to anyone going through a difficult/challenging divorce. They will not disappoint!

In a contentious divorce proceeding, I needed a robust litigation team. Costello, Brennan, DeVidas, Sasso and Sinclair was just what I needed. Attorney Kieran Costello, with his in-depth legal knowledge and Attorney Edward "Skip" Sinclair, with both his legal knowledge as well as his financial background, brought the case to a successful conclusion. I would recommend CBDSS to anyone.

I hired Kieran Costello to represent me in my divorce and I couldn't be happier. He is very responsive and kept me informed throughout the case. Kieran is very knowledgeable and, in my opinion, is the best in the field. Before I hired Kieran I wasn't sure how I was going to be able to get through the process, but with his advice I was able to obtain a very favorable result that I didn't think was possible.

Kieran Costello is the only lawyer I trust to represent me in my custody battle. I was in the worst situation possible before I met Kieran and I thought I was really out of options and scared that my relationship with my children was gone. I highly recommend Kieran. He will fight for you.

I used Chris Brennan for my divorce case and I would highly recommend him! He was attentive, cost efficient and stood up to my bully ex.

Claire DeVidas represented me recently in my divorce. I was very happy with her attention to my case and how she went above and beyond to keep me informed through the whole process. She really cared about me. I highly recommend her.

Divorce is, almost without exception, a difficult and painful process. I am incredibly grateful to Kieran Costello, Megan Leffard, and everyone at Costello, Brennan, and DeVidas for guiding me through with expertise and compassion. They were professional, reliable, and communicative. I was never left wondering what was happening or why. When I reached out to give or receive information, responses came in a timely manner.

I have recommended Kieran to a friend and will continue to recommend Kieran and Costello, Brennan, and DeVidas without hesitation. As my marriage deteriorated, I prayed for a miracle and found one. Many thanks for helping me navigate my way out of my previous situation and into my new life.

I hired Chris after getting seriously injured in a work place accident. He was able to fight the worker's comp. commission in order to reach a very favorable settlement for me. I highly recommend Attorney Brennan.

Chris Brennan worked on my personal injury case. He took the time to explain the process, the steps required to resolve my case and kept me informed. I had a great deal of confidence in Chris, he resolved my claim to my satisfaction. I highly recommend Chris to anyone looking for legal representation for a personal injury claim.

I first consulted with Kieran Costello, who was humorous but very knowledgeable. He then handed my case to Attorney Mitchell Teta. Attorney Teta has been amazingly helpful and assertive in dealing with my child custody case. He is honest and direct, and continues to help me fight in court for the best interest of my child. I can't thank him enough for all he has done. Highly recommended firm and law office.

I have enjoyed dealing with Kieran Costello over the last few years. I always appreciate his direct and professional manner and his staff and partners are always courteous and professional. I recommend Costello, Brennan, and DeVidas with confidence to anyone needing a good attorney.

I would like to say that Attorney Mitchell Teta is a great attorney. He really helped me with my case.

I interviewed several law firms and was glad to have chosen Costello, Brennan and DeVidas. Working with Attorney Teta and Attorney Sasso I always felt informed and protected. I highly recommend this Firm.

I have referred Christopher Brennan to many of my clients. He has successfully closed several Real Estate transactions and has always delivered top notch service. Past clients have also retained Chris for evictions, misc. litigation and divorce with the same positive results. He is a diligent worker and always responds in a timely manner. I have only received positive feedback from my clients and will continue to refer Chris clients in the future.

The Costello, Brennan and DeVidas, P.C. office, specifically Anthony Sasso, Esq., was extremely helpful and attentive helping me through a personal matter during a difficult time. The results we super positive and the stress was minimal. I recommend.

I was injured at work and was out for many months. I reached out to a close friend who gave me the name of a respectable law firm called Costello, Brennan and DeVidas, P.C. He told me to ask for Chris Brennan saying that he's a young, bright gentleman who is well respected and will waste no time in dealing with the adjuster to help me collect the wages that are due to me. I called and spoke to Chris explaining my situation and he had me come to his office the very next day for a consult.

The end result is that Chris delivered for me and he did this in a timely fashion. He not only had the insurance company bring me current money wise but he was also instrumental in helping me obtain the OK for the surgery that I desperately needed. Lets face one important fact here, weather your going through a divorce or you've been injured on the job or otherwise you want to know that the people or person you've hired to represent you in the court room is a competent and savvy individual.

If your unsure as to who could help you in a tight situation that you never asked nor expected to be in and your going to thumb through a phone book to pick a lawyer. Don't, call Costello, Brennan and DeVidas and let them prove to you like they proved to me that they can and will live up to their reputation as a class" A" law firm.

There is no room for second best when battling divorce and domestic violence. It can be one of the most challenging experiences of your life. I count my blessings each day and thank God that Kieran Costello is on my side. His compassion, intelligence, and commitment to justice has and will continue to ensure the safety and well being in every way of both my child and myself. Not only can you trust that he will help you to achieve your desired outcome, you can trust that he and his staff are going to give it their all each step of the way.

Only the best attorney will always ensure a return phone call before the end of the day and not only make sure your concerns are addressed, but end the conversation with a blessing. God Bless you Kieran and staff!