Master 4's recent conversation with his grandmother visiting from the US, during dinner at our place:
[grandma had left over some veggies on her plate]
Master 4: "you are not allowed to leave anything over, grandma, the rule is 'if it is on your plate, you have to eat it', that's the rule, grandma."
Grandma: "well, if I don't like it, I don't have to eat it."
Master 4: "yes you do, grandma, daddy and mummy are grown ups, they know better than you... and you're not the boss of this family!"
Son: 1 - Mother in Law: 0
edit: sadly, he did get in a bit of trouble for this - being rude, yada yada, but we gave him a fairly soft landing cos it was so darned hilarious, not to mention appropriate given the MiL's, let's just say, tendencies...