My son started umpiring little league games a few years ago.  He has always been a catcher (as was I) so he was used to seeing the strike zone, which i think makes it easier.  Hopefull one day, we will get a chance to do some HS games together as a crew when he comes home from college in the summer.  As far as basketball, there hasn't been the same opportunities as baseball.  Just finished my 15th year as a certified official.  Which happens to be the age of my son.  My wife blames him for driving me out of the house.  
