How do I get them to listen?

I have started to notice that no one- daughters or husband really listens to me these days! And I'm becoming the nag that I never wanted to be. It's very unfulfilling as a mommy and wife. My oldest daughter gets it, but suffers from the "I never want to be wrong or admit I have not done something to the best of my abilities" syndrome. My husband believes if you don't admit it, you cant be held accountable for it, and my youngest thinks if you wine and pitch a big ole'fit, then no one will have the chance to incriminate you. It's three against one, and I'm thinking about escaping them and leaving them on their own for a day or two when I go on a much needed, long over due mommy vacation... Those poor unsuspecting children and man have no idea their evil mommy and wife is capable!