Tell him to go himself. You don't want to have anything to do with them, so why the hell should you?
Let him take dd (They are her aunts, gran, uncle etc) you can't be accused of keeping dd away from them if you do this.
This happened to me.
SIL is a venomous little bitch. She can't have children and hates me as we have 2, one of each sex. Whilst I did initially feel for her and included her in almost every aspect of my own children's lives, it soon became clear to me that she was going away, saying things about the way I parented, saying if my kids were hers, how she would do it. She also told people lies about me that cut deep.
I stopped talking to her and she started telling people I refused to let her see the kids. That was untrue, as dh always took them to MIL and she was always at MILs house. Then MIl started telling lies about me too, egged on by SIL. She told lies about me in front of the wrong people in a bar one night and the story was told back to dh at work one day. He stormed down and had it out with them all. SIL cried and denied it all... whilst MIL ried to work out who could have overheard them
Anyway, I let it blow over, and let MIL come up and apologise to me, I know I had done nothing wrong, apart from marry her son.
SIL and I are on very very odd speaking terms, as she works locally in a place I have to go quite often, so it's stilted conversations, but passes.
I choose not to go to family gatherings, (usually making excuses) this way, the kids have a relationship with their grandparents, aunt, and I am relatively happy about it,without having to put up with them and their nasty ways.