I think your bigger concern ought to be your wife. One of the first
things I learned as a low time pp from my male colleagues was the high
AIDS epidemic amongst the men:

Aircraft
Induced
Divorce
Syndrome

Amongst most of the male pilots I know, unless they have a wife who
likes to fly with them, they eventually faced the "wife or the airplane"
ultimatum. While I'm not saying that you will ever find yourself in
this situation, you probably should deal with this problem now while you
are still taking lessons. Otherwise you are going to be facing an
uphill battle trying to get your son involved without your wife's
approval. Your son is too young to really appreciate aviation. Your
wife is not. If you can get her on board, you will find it much easier
to eventually get your son involved if both of his parents are
encouraging him.

If you'd like some advice on helping the wife learn to appreciate your
flying, drop a post. Us women folk tend to be attracted to different
aspects of aviation than men and often have different fears and concerns
and ways of getting over those fears and concerns. I'm sure the women
on this list as well as the husbands with flying wives would be happy to
share some tried and true advice to help you teach your wife to
appreciate flying.

Helen