I am (was) in the same situation --- I no longer had contact wit my biological family and was "adopted" by a family who took me in as one of their own in every way.
It was difficult at first -- a very tender loving family after all the years of abuse --
What worked for me - US was family counseling with my T -- he was able to explain things to them and help us to relate to one another and understand each other's needs.
Family counseling was definetely a plus -- I pray that all will continue to go well
my "adoptive" family has been with me for over 30 years now -