I just found this forum after doing a search in desperation. My adult (?!) SD37 I believe is taking after her bipolar (suicide) BM. I'll spare the details now, except to say she is quite the user. I raised her from age 5 on, but there is nurture, but apparently nature overrides that. I've come to realize that at 37, her morals (as evidenced by her actions) are who she really is.
As I read the other posts, I am struck by the anger evidenced in just about every narrative. It hit me like a thunderbolt. I was always a positive person, always optimistic, a "wake up happy" kind of person, and this girl has changed me into an angry person. I told her off about a week ago and told her after all these years, I don't care what she thinks of me. She uses us, when she needs support or money we are wonderful, and the rest of the time we are despicable and can go to hell. Well, as DH says, the bank is officially closed.
I saw a horoscope a few days ago that said to "practice serenity in your life", and boy, that is what I need. Rather than let this juvenile-acting "adult" continue to drag constant drama into my life, I need to move past it, and only respond when she can act like an adult. I miss the real me, and am tired of the angry me.