My 12 year old writes with his right hand, but he was ambidextrous in Kindergarten and he could write equally well with both hands. He often uses his left hand to eat, especially if he is at the computer. He uses the fork with his left hand while he uses the mouse with the right hand. If he uses his left hand to eat at the table, he sometimes bumps into me since I am right-handed and I can just ask him to switch hands.