About The Firm

Cosmas Onyia went to law school to make a difference in society. During law school, he realized that family relations are the foundation of any community. He believes family disputes are the primary reasons behind society’s problems, creating mental health issues and pushing children towards crime and substance abuse. That means it has a generational impact.

To make a difference in society, he established the Law Office of Cosmas Onyia in 1996 to help people resolve their family disputes. Unlike other family law firms, we provide personalized advice to achieve the best outcome for you and your family. We do this by proposing the best parenting plan that safeguards your child’s best interests and negotiating a fair settlement for you.

Our founding partner, Cosmas Onyia, has been practicing family law since 1993. He has successfully handled complex family law cases, including military divorce, child custody, and covenant marriage divorce. Renowned legal directories such as Avvo, FindLaw, and Justia recognize him as one of the best lawyers for a family dispute case in Phoenix. He aggressively advocates for his clients in negotiation or trial, helping them protect their best interests.

With more than three decades of experience, he understands that family law matters are sensitive and filled with emotions. Thus, he handles them with compassion and care. Furthermore, he uses his experience to determine when it’s appropriate to go to trial and when it’s not.

Our practice exclusively focuses on family law. We handle all types of family law cases throughout Arizona, including:

  • Divorce
  • Legal separation
  • Child custody and child support
  • Alimony
  • Visitation rights
  • Division of property between spouses
  • Prenuptial agreement
  • Order of Protection
  • Grandparents’ rights