I have three stepdaughters (aged 9, 13, and 16).  Their dad and I have a new daughter together along with my 9 yr old son from a previous marriage.  Quite the blended family.  His girls visit us every other weekend.    16 yr old SD has always been resentful and bitter of me.  While her dad and I dated she did everything she could to break us up.  We really thought she'd settle with time.  We've been married just short of 2 years.    Dh was single for 7 years...