Nicole Matei| Mountain Sledder Magazine
A precedent-setting decision was made in BC courts recently in the case of an incident involving mountain sledders. In it, an Alberta snowmobiler was found to be 100% liable for damages to a fellow rider after failing to wear his snowmobile tether cord (Passerin vs Webb 2018).
Since your man is not a big mountain rider, it can be assumed he will not have a valuable opinion to contribute here. Fortunately, this means you can forgo involving him in terrain choices or decision making for the day. This will sidestep the potential for a disagreement based on a difference of opinion.