About Gage Family Law

Gage Family Law is a small family law and estates firm in Oakville, Ontario, operating under the corporate name Marian Gage Professional Corporation. Founder Marian Gage began practicing family law in Toronto in 2003, initially appearing in court almost daily on behalf of clients. In 2010, the practice moved away from courtroom litigation toward mediation and collaborative family law, an approach the firm says usually produces a more workable outcome than a trial. Marian Gage is a Certified Specialist in Family Law, an Accredited Family Mediator and an Accredited Intergenerational Mediator, and serves as panel counsel for the Office of the Children's Lawyer.

The firm's team of five lawyers and mediators brings varied backgrounds together: one trained at Harvard Law School and was called to the bar in New York in 2004 before Ontario in 2018, another built a law degree from the London School of Economics into licences in both England and Ontario, and a third practiced family law in Nigeria before being called to the Ontario bar in 2013. Alongside mediation, collaborative process and family litigation, the firm handles wills, powers of attorney and estate administration, and it offers lower cost options such as unbundled retainers, family law coaching and virtual law clerk support for people representing themselves.

Milestones & recognition

  • Founder Marian Gage began practicing family law in Toronto in 2003 and moved away from courtroom litigation in 2010 to concentrate on mediation and collaborative family law.
  • Marian Gage holds credentials as a Certified Specialist in Family Law, an Accredited Family Mediator (AccFM) and an Accredited Intergenerational Mediator (AccIM), and serves as panel counsel for the Office of the Children's Lawyer.
  • Marian Gage is serving a second three year term on the Board of the Ontario Association for Family Mediation.

In the community

  • A lawyer at the firm serves on the steering committee of the Women of Halton Action Movement and has previously served on the board of Community Development Halton.
  • The firm participates in formal mentorship programs through its law association and the Ontario Association for Family Mediation, offering guidance to new lawyers and mediators entering the profession.
  • Marian Gage is active in Collaborative Practice Hamilton Halton and the Peel Halton Collaborative group, local networks of family law professionals trained in the collaborative process.

Good to know

A person using a wheelchairWheelchair accessibleA professional woman in a suit beside a briefcaseWoman-ownedA rainbow pride heartLGBTQ+ friendlyA laptop showing a video callVirtual appointmentsAn office interior with a desk and chairsIn-person services

This firm’s lawyers at a glance

Called to the bar
2001–2018 · median 18 years in practice 4 of 5 lawyers
Law schools
Harvard Law School, London School of Economics 2 of 5 lawyers

The neighbourhood

Gage Family Law's Oakville office sits in the Cornwall Business Centre, a multi tenant professional building on Cornwall Road rather than a converted house or a downtown storefront. The Halton Region head office of the Canadian Mental Health Association operates out of the same building, putting a family and estates practice alongside a community mental health service rather than a courthouse strip.

The firm's lawyers are active in collaborative practice groups that span Halton, Peel and Hamilton, reflecting a caseload that draws from across the wider region rather than Oakville alone. Clients who would rather not travel to the Cornwall Road office can meet by video conference instead.

Frequently asked questions

What areas of law does Gage Family Law handle?
Gage Family Law focuses on family law and estate matters, including separation agreements, marriage contracts, mediation, collaborative family law, parenting and support disputes, family litigation, wills, powers of attorney and estate administration.
I'm going through a separation in Oakville. Can the firm help me avoid going to court?
Gage Family Law offers mediation and collaborative family law as alternatives to litigation, where both parties work with neutral professionals to reach a separation agreement without a trial. The firm still represents clients in court when a matter can't be resolved that way.
Does the firm handle wills and estate planning as well as family law?
Gage Family Law's estates team prepares wills and powers of attorney and handles estate administration, family trusts and multiple wills, alongside the firm's family law work.
Can I meet with a lawyer online instead of coming into the Oakville office?
Gage Family Law meets clients in person at its Oakville office or by video conference, whichever works better for the client.
I can't afford a full retainer. Does Gage Family Law offer other options?
Gage Family Law offers unbundled services and limited scope retainers, family law coaching, and virtual law clerk support, so clients can pay for specific tasks rather than a full retainer.
What is intergenerational mediation, and does Gage Family Law offer it?
Gage Family Law offers intergenerational mediation for multigenerational families working through aging related decisions such as housing, caregiving and estate planning, bringing family members, caregivers and sometimes friends into the conversation rather than just two parties.

Where to find them

1540 Cornwall Road, Suite 213, Oakville, ON L6J 7W5 · 905-849-3013

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Listing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗