My Boyfriends Grandmother HATES Me!

This is such a silly post. I don’t know why I am so bothered but I am. I need advice. Background - My boyfriends family dynamic is the complete and polar opposite of mine. My family is all very close, always doing things together and surprising each other for things. (Bf was totally flabbergasted that my entire family flew to chicago for my cousins surprise engagement, it was a whole sob fest). His family is not close at ALL. He’s close with his sister and parents but everyone else, aunts, uncles, cousins, grandparents, he barely knows them! I mean like literally, he confuses his two cousins names because he can’t remember. Like they uninvited us to their wedding because they needed to make room for other people lol. So now that you have background, his grandmother absolutely despises me. I’ve only met her 3 times! And each time she will just sit there and scowl at me, has told his mother “I don’t know why he is with this little girl.” We’re all grown (I’m 26, bf is 28). I do have a 4 year old son from a previous relationship and I wonder if that’s it, or if it’s because I am Hispanic and they are white? I don’t know and nobody in his family can explain, they just say “she hates everyone.” Well we have Christmas dinner coming up on the 18th and she will be there. I need advice as to what to bring her. In the past we’ve brought her pretty bottles of wine bc we just had no idea what else. I’d like to get her something she could really appreciate. Any advice? She’s older and in very poor health. I just don’t know. I hate feeling like I’m ruining her family time but….this is my family now too! Am I caring too much? I am just so not used to this kind of….family animosity. I want to bring her joy, and show her that I love her family just as much as she does.