unusualtitle

Hi, Last year I earned over the 50,000 threshold (over 60,000 in fact) and am required to pay back Child Benefit for the two children my Wife claims for and are living with us. Whilst getting things in order, I noticed that the 2 children from my previous relationship are still under my name, but the benefit is going to my ex partners account. I have not been receiving the child benefit for those 2 children, which is fine. The account its going to is solely her own account. We updated the account back in 2016 when we seperated so that it was paid to her. I am wanting to do a tax return to pay the child benefit my wife and i have received for the 2 children that live with me. How do I sort this so that I am not going to be asked to pay back money I havent received for the 2 children from the previous relationship? Thanks