Adult son broke his femur after slipping on an icy sidewalk in front of a downtown Toronto home last Thursday.

Hi, looking for advice. My adult son broke his femur after slipping on an icy Toronto sidewalk, in front of a home. Paramedics took him to hospital, where he currently remains after surgery. Photos of the scene were taken by the paramedics and others. He works in a warehouse, so won’t be able to work for several weeks, and will have to temporarily relocate to family who don’t have stairs. My question, we know he has 7 days to submit an online form to the City of Toronto, but thoughts on if he should do this prior to seeking legal advice? Thanks in advance.