My pop is ambidextrous after also having his left hand tied back by the nun's. 2 of his 3 sons were lefty's, my dad righty. As far as I know we're the only grandkids that are right handed.
DD1 was/is slightly ambidextrous. In kindy she was quite comfortable using both hands to write/colour in. She now favours her right for writing etc, but with sports she still uses both pretty equally. She's great at all sports & with netball etc I think it definetly helps her, because she's comfortable catching/passing from both sides.