We all must do what is right for us. I do love my mum because I know she cannot help it but I am not going to allow her to emotionally bully and blackmail me. I was raised to have a mind of my own and that's what I am going to do.
That is the exactly the right attitude, poster, so I'm surprised you didn't meet up with your cousin just because your mum told you not to.
My sister in law is upset with my son because he has given his new baby the same first name as her son, who now in his thirties but has been estranged from her for some years now.
I do understand why she is upset, but that doesn't give her any right to interfere in my son and his wife's decision about what to call their son, particularly as they never see each other anyway.
You can listen to and respect the other person's view, but you don't have to necessarily agree with them or do as they say. And not telling someone something is not the same as lying if it keeps the peace.
I wish you well in whatever you decide.