Just reading another thread & in it, MIL had let herself into the OP's house. Made me wonder if this is 'normal'. My sister & I have each others keys but they're for emergencies, we wouldn't dream of just letting ourselves in. My fiancé, on the other hand, everyone seems to have a key to his place & they just walk in when they please. I've had his brother, mother & SIL walk in on me on separate occasions while I've been at his alone. It felt really intrusive & disrespectful because I'm not used to it ever happening in my home.
Is it your normal to give keys to family & allow them to come & go as they please?
YABU - It's normal & I don't mind.
YANBU - No. It's not normal.