Great topic!
As a parent: Regarding my son, wathcing him smile on a diamond knowing that he thinks that's his home away from home. Knowing that he has now taken that warrior attitude to the classroom and really focusing on grades.
Daughter: Knowing that she has the courage to take on Arhtritis day in and day out, and win. Watching her take top honors in a belt test for martial arts is certainly up there too.
As a fan: watching them both grow up.