I have never seen a list like you suggest.

My thought is that all activities needs to be considered with common sense.

Skiing is not inherently risky from a concussion standpoint. The risk with skiing in non-competitive and non-extreme situations come from getting into a collisions with other skiers or more often snow boarders.

I was an early user of ski helmets for just this reason.

Some ski areas and ski runs are more congested and risky than others. His skiing ability and control should be considered.

I learned to ski right after a major issue with concussion problems. I just had to wait until the doctor got my seizures under control.

So, just discuss the factors I mentioned with you husband. With some simple safeguards, you son should be fine. It will be good for them to spend a day on the slopes together.

So, where does he want to take him skiing this late in the season?