T.P.
No you are not asking too much. I have a cousin who always had terrible table manners. He ate like a cow. I had a friend over one Thanksgiving and she almost to sick watching him. Fast forward to his teen years and he still ate the same way. He finally gained control of his manners when he was teased at school for eating like a pig. So no start now. I have had to correct my daughter too. The way I did it was by telling her that she was going to Kindergarten and she needed to eat like a big girl and not a baby. That worked for me. Good luck.