Don't have many here, outside of Game Day house rules (not sports games, nerd games). Like "He who brings pizza is eligible for extra experience points," "He who amuses/impresses the DM is eligible for extra experience points," and my one contribution to the list, "Clean up after yourself; the woman of the game-hosting house is not your mother." I haven't had to enforce that one with a heavy hand, thankfully, after a one-time mention.
Oh, there's also "Don't share food with the dog (without asking)", but this one is pretty safely unspoken. I just hate cleaning up dog puke and I don't want to have to yell at anyone for feeding her something that will upset her stomach. And "Don't smoke in the house", but that's been a given because of my kid(s) and how understanding our group is.
We haven't really been a family long enough to have made up any stupid rules; husband and I are on pretty level wavelengths with each other to understand why any given rule exists, be it for financial, hygienic, or convenience reasons.
Neither of our families had many stupid rules, either. Not that I can think of. His dad is a little bit neurotic over appliance usage and internet usage, but that's a financial reasoning.
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