If it’s a well written character, he would understand that Abhi is biological father and he has an equal rights on Abhir. On any legal document there should be Abhi’s name unless biological father agree with it.he should not have an issue with that.
He should know that changing the name on BC is forgery and yes he didn’t do it but he supported instead of telling her that she can’t do that.
He should not keep repeating that Akshara aaps” still mother hain but he is not. He is manipulating Akshara emotionally and Akshara is doing this to satisfy her and his ego and her jidd and anger.

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