In Al Capone Does My Shirts.... Why doesn't Moose tell his mother about the call from Mr.Purdy? Do you think he makes the right decision in telling his dad?

Moose doesn't want to upset his mother, as she has her heart set on Natalie's success at the Esther P. Marinoff School. He tells his father because he cannot do it himself..... which possibly isn't such a bad idea.