Don't give in to her manipulation. That wouldn't be fair to your grandmother or to you. She has some nerve to try to keep you from seeing your grandmother because of her petty feelings. She has no right to get between you and your grandmother. Your relationship with your grandmother is none of her business or concern. Contrary to want she seems to believe, the world does not revolve around her and her every little want and need. I'm not sure where you're planning on staying, but if it's at her house maybe you should consider staying with someone else if possible. It's obvious she has no respect for you and personal boundaries. She only cares about getting what she wants. It would be a shame if she ruined your visit because she isn't mature enough to keep her mouth shut like an adult.

Wtf

Make up your own mind. Going only on what I can see, your Grandmother stepped up and got you home. Your mother is trying to rope you into her drama.

Whatever happened is between your mum and your paternal grandmother so don't think too much about it. Go see your grandma if you want to.

Being a guy that got manipulated by his grandmother against his mom until the day the old lady died, let me tell you one thing: don't let your self be dragged into this. My grandma hated my mom and always tried to put me against her. She never succeed, but her trying was a pain in the ass. Visit both and make it clear that they are grown ups and should solve their own problems.

Did you remind your mother of this tid bit??

My mom disliked my grandmother (and rightly so, she was mean to her for "taking her son") but she never tried to interfere with our relationship with our grandmother.

Even if her hatred is justified, guilt-tripping is a shitty thing to do. Anyone who uses that method to get what they want should be avoided by default, in my humble opinion.

Your grandma loves you. I assume you won't listen & will visit her!

Sucks to be in the middle of awkward family drama. But I think you know the right choice here.