I'm stuck on how to confont my mother without being to harsh
I am 26 years old and When I was 2 my mother left with one of my 2 brothers. Come to find out she was hooked on drugs and it would be something that she truggled with for many years. So fast forward 13 years. My father brother and I now live across the country and my oldest brother locates us and begins to be a part of our lives again. Well in the process I become reunited with my mother. After being back in contact with her for about 6 months my father agrees to let me go try and live with her. That lasted about 2 months before her current husband can't stand me. She drives me to her sisters house drops me off and says she is leaving her husband and she just needs to set something's up before I can go back to living with her. Well 2 months pass and she has not called me once. Come to find out she dropped me off drove back home and basically forgot about me. So my father is tired of waiting on my mother and decides to fly me home. That was the end of that. So fast forward 11 years and I have a very close relationship with my brother (that was gone for years) his wife and family. I now have built my own family as well. But I have not had a relationship with my mother. She is now reaching out to me saying she wants a relationship with me and wants to get to know my son and husband. But I am reluctant to let her back in. She has asked me to write her a letter and tell her why I am angry with her and I am not entirely sure what to say. I desperately need help on how to go about this problem and need some advice. Please help.
*angry and confused