God, I could write a book on this topic. Right down to the part where my mother "borrowed" a ring from my W, lied about not knowing anything about it, then lieing again when we discovered my mom had given the ring to one of my sisters with the instruction not to tell anyone about it until my sister's D (who my mom said the ring was for) was 18 (my neice was about 2 at the time). The hardest discussion I had was to bring it up to my mother, hear her lie to me, then try to lay a guilt trip on me.
Ok, sorry for the hijack Thinker. Just setting the stage.
There were others episodes where my mom was mean in a passive-aggressive sort or way, to my W.