My 7yo and 9yo grandsons are living us now, and some of their bad behavior that was allowed by their mom has been easy to correct. But one thing that hasn't is their affinity for potty humor. Making comments about "butts," underwear, "farting," "pee," thinking it's all funny, and doing such things as deliberately shaking their bottoms at each other, passing gas loudly, pulling on each others underwear, and urinating on the water meter outside--it's more than I can stand! I cannot BELIEVE they were allowed to act like this, although their mother did not give them love or discipline,, which we give. Do you have any advice on how to get my children to behave.