Long but please read...,Ok I saw a Similar post here that got me thinking about stepkid.

For the last five plus years step kid who is 13 has been complaining how he HATES BM and wants to live with us. SS would say BM favors her “new kids” with her new husband over him. BM would Blaim everything on him. BM would not help him with his homework, call him nasty names, and take away his toys for no reason. There has been many Occasions where he would break down crying because he would not wanna go back to BM. Every visit SS would complain about BM. Again this was not once or twice thing because BM Punished SS and he was pissed so he said nasty things about her. No this was a on going issue for FIVE YEARS. SS has even started calling her “the witch”. 

We have been working with an Attorney for the last two years trying to get full Custody of SS due to this. SS is Aware of this and all for it....intill last month 

SS and DH had a MINOR Argument, words were Exchanged and DH told SS he could go live with his mother if he did not like it

SS lost it. Threw DH computer at him which hit DH and broke. SS went on screaming/crying that He’s been LYING about BM and that he really loves her and that she is the best mother. SS went on screaming/crying that DH is a Awful dad and he knows DH is trying to brainwash him against BM who is really good to him. Both DH and I were SHOCKED at this turn of events. Just the day before SS was calling her the witch and complaining about her AS NORMAL. Now DH has always been honest with SS. BM is very controlling and made everything difficult for DH. If SS wanted to come over and BM said no DH would tell him BM said no. Things like this. SS does now both parents hate each other. 

Now after this Outburst SS went up to his room and came down “normal” like nothing happened. A WEEK later DH mentioned BM may not like him doing something. SS Demeanor immediately changed and he raised his voice and said I told you I don’t want to talk about my mother and walked away. SS has totally stopped complaining about BM cold turkey and Refers to her as mom. If DH even mentions BM SS Visibly becomes upset and walks away quietly. 

So don’t after FIVE years of telling us how he hates her SS over night thinks she’s the best mother ever. This tells me SS WAS lying about all the things he was saying about BM BUT why???? Now DH and I have a huge mess as we are in the final stages and paid Thousands to the attorney to get Custody and EVERYTHING has changed but why???

Any thoughts?