((((((Rhapsody)))))))))))))))))) I think the best thing you can do is support him. Guide him the best you can. Maybe talk to them both as adults about paying attention to studys too. As she will have to too. If she is in college. That is what i have done with my daughter.
The first year of college is the hardest I think on kids so much going on.
Have faith I am sure you have raised him well he will do good.
Its hard to let them have thier wings and fly. When they do what a great feeling it is to know they can do it.
Wish you the best
muffy