Emma Costain is an associate lawyer at Nelligan Law  and a member of our Family Law Group.

Emma handles all kinds of family law matters, both in and outside of court, and has developed a growing sub-practice in estate litigation, with a focus on cases at the intersection of family and estates law.

Emma understands that disputes arising from a family breakdown, and issues stemming from a loved one’s incapacity or death, are stressful. She is committed to helping her clients navigate what is often an emotionally exhausting legal process, at a time when things can already feel overwhelming.

In her practice, Emma strives to make her clients feel both at ease and well-informed. Her goal is to be approachable and to give straightforward advice, knowing that clients must fully understand their legal options before moving forward.

Emma is passionate about making the law more accessible to the public. She recently co-authored a study on the literacy requirements of court forms as a barrier to access to justice, and she assists law students improve their legal writing, advocacy, and client communication skills through her ongoing volunteer work.

Before joining the firm, Emma completed a clerkship at the Ontario Superior Court of Justice, where she worked with judges on a range of family, civil, criminal, and administrative cases at both the trial and appellate levels. Now, she draws on her analytical skills to advocate for others.


  • >Bachelor of Arts in Politics (Honours), Acadia University (2014)
  • >Juris Doctor (Summa Cum Laude), University of Ottawa (2017)
  • >Call to the Ontario Bar (2018)