Here's the situation... I have a friend who lives out of town (a day's travel by car). We haven't really spoken much since we left high school but I'd still consider him my friend. I'm 99.999% certain he doesn't read this site.

His mom still lives in town, and we just found out the cancer they thought was under control has spread, it's really bad, and she's already registered to enter hospice care.

The problem, IMHO, is that his Mom doesn't want him to know about it right now, because he and his family are going to Disneyland in a couple of weeks and (I presume) she doesn't want him to cancel the trip on her behalf...

I totally disagree with that though. What if she dies or goes into a coma or otherwise becomes unresponsive before he comes back from vacation? It doesn't seem right. I want to tell my friend that his mom is sick, but I don't feel I have the right to do that. But I'm one of very few people who know she's sick and know how to contact him, and I worry about him having to possibly live with a really bad and avoidable situation.

Have you ever had to deal with a situation like this? What would you do?