My daughter's last resort is also to threaten to tell my husband, which at first I really didn't like- I don't want him to be the bogey man. He is not their actual Grandpa,- they have one of those, but he doesn't get involved much. But my DH is a very gentle man who never needs to raise his voice to them,and has a natural air of quiet authority. He involves them in any chores he is doing, handy work DIY, whatever, and they just have huge love and respect for him, and therefore hate being in his bad books, so whatever works! We do it our way if we have them in our house on their own, but if my daughter is here she is the authority, and yes we do have to bite our tongues now and again!