I feel for you OP, that must be really hard to deal with. My mum is single (and has been for the best part of my adult life) and literally LIVES to work so she has the financial means to help her 3 daughters and thier children (her grandchildren). She is not perfect, and my older sister and I get the shiz with how much time, money and energy she gives to my younger sister... but we love her so much. She is kind, generous, funny and smart. With all the things she annoys me over, it is really nothing in comparison. I can't complain. She is a huge influence and part of my life (and DH and kids) and Id be lost without her! She has recently told us that her mum is on the way out (they never had a good relationship - kids were a by product of marriage etc) and that her portion of the inheritance will go to is 3 bc she has paid off her house and doesnt need it. Dont get me wrong, it is not much, but OMG. How selfless can a mother be. I hope I can be half the woman she is and not just because of her financial generosity.
I think I might start a mum appreciation thread.