Dear Annie: I have an abusive mother, and for many years I put myself in her path. Any time I opened up to someone about her behavior, I heard, “But she’s your mum,” or “She means well,” or “You only have one mother,” much like the letter writer “Chosen Family.” All that did was to cement my mother’s accusation of my nastiness. I do know why she is the way she is. My grandfather was a horrible…