What a load of rubbish about the names. Just say you decided you didn't like their original names and you now prefer these. Even better legally change them so the abc names are their middle names instead as they will now always have confusion growing up with forms, ID and school registers etc. Or if you aren't going to do that just stick with their original names which are perfectly fine and you chose them so its on you if you don't like them now. Not ohhh I want to seem a bit more hippie and surfer on my instagram so I will start calling them by their middle nature names but do nothing legally. And the oh better stop talking now about the 'trauma' she means before she says more lies about the poor father while she's in the middle of a legal case