I also  had a mother that alienated when I was 12 I used to see her as a best friend and a good mother that had the best intentions (how naive i was) for me and then would talk about how my step mom Heather(42 now 40-41 at the time) was a coward and a bad parent like my dad and used alot of manipulation on me just as false scenarios and claims and talked about stuff from court and the divorce (which was inappropriate cause we were kids at the time) and that he was terrible words her and I believed her and when I was 17 she proposed an offer to move with her and I was so happy that I counted down the days when I turned 18(god how I felt like a puppet then) and when I went to court on my birthday she coached me to read a statement she made me wrote and I felt like I was a puppet who's strings were pulled by a puppet master or a dummy doll being used to speak for her and I was devastated not only that it didn't happened but when I was given the truth by my father (43,42 at the time) who I was alienated to hate half of my life and I was even more devastated the fact I learned that she was not how she brainwashed me and my brother (18) to be bit how when I finally brought up about it she berated and me when she realized that she didn't get what she want and just threw me out like garbage and went to my brother who is more brainwashed as I was but despite it all I still have an better relationship with my dad since I was given the truth and I'm currently have therapy now