RE: "He's always smiling" Yeah, but you don't live with him!!!
We were that way growing up. My mom used to ask us all the time why we didn't act at home like we did in public.
I'm starting to either ignore Payton's whining, ask him to ask nicely ("Payton, why don't you say, 'Milk, please.'?") or distract him from whatever he's whining about, get him calmed down and in the mood to ask nicely. These methods are not 100% foolproof, but they work at least 50-75% of the time (which is better than never!).
Heather
Mommy to DS (9/03) and DD (5/08)