Dear Abby: How do I tell my nosy parent they don't need to know everything about my life?

Dear Abby: I have a parent who thinks they should know everything about everybody. If I get something in the mail, they will read it to see what it’s about. If I go shopping, they want to look at everything I bought. If I take out the trash, they want to know what’s being tossed. Today, they asked somebody how much their employer is paying them! If I don’t tell them everything, they say I’m being rude.