As a single parent to one DD, working full time, mine is, "Be your own best friend." I.e. have a wine when you need one, or a lie in, leave a cup out the night before with a teabag ready, lay out DD's clothes.
DD's is, "Be kind, have fun." If you're not being kind then having fun isn't ok. You must be both.
Anyone else? I often thank "yesterday me" for the stuff she did for me today...is that odd?!?
YABU = I'm a weirdo
YANBU = that's ace!