So the 1st one was about whether she should claim. While historically he was a weekend dad he was now, and had been for a long time 50:50. He pays for their dental, medical and phones alongside having them half the time. In addition to this he allowed her to claim child benefit for them both and gave her £300pm. But OP discovered hed been promoted and was earning "loads" she asked for more and he said no.
Then there was the 1st one about his rival child benefit claim. So she took him to CMS, and based on info she provided. 50:50 but she does all the school admin/forms and he just sends her his share AND crucially she was the one receiving Child Benefit she would be seen as the main carer. So she claimed. He was raging and appealed and was rightly told CMS align to child benefit. If Child benefit deem her the claimant they accept that. So he put in a rival claim for child benefit for one of the children and they each got one child.
She was really angry that this would reduce her CMS and take away half her child benefit. Bear in mind multiple times he said they could both drop it, she wouldnt because she believes while its now 50:50 he only has all this money because he focused on his career when she had them through the week.
They fell out and the teenage boys are spending more time with dad. More than 50:50, one was at his almost all the time and the other doing 60%+ with dad so because CMS then said she wasnt entitled to more but there was still this back dated 50:50 bit from her CMS claim hes put in his own CMS claim for the current situation and theyre both now exclusively at his.
There were multiple points to have stopped this but she was adamant she was entitled to it, it was his fault, it was CMSs fault, our fault for even thinking she would take advice (she asked for) from Internet strangers.
And tbh i disagree about the ex going for the money being a dick move. He now has both boys full time and they deserve support of two parents, and he was giving OP £300 while he was 50:50, and paying medical dental phone contracts and other incidentally.
However for me the saddest thing is her children dont want to see her. And i think OP should close the thread and try and reach out to ExP to discuss how she can rebuild the relationship with her children because thats the part that matters most