Boyfriend and I moving in, his mother does not like me. Also doesn't want me in her house.

28/f and 25/m together for almost a year. Moving in in a few weeks.

Just wondering has anyone else had to deal with this? My boyfriend and I have talked about getting married one day and having kids. Obviously we are using protection and being careful, as well as being really smart about everything. Ideally I would like for his mother to be part of our lives together. So long story short, he was single for about 4 years before me and she relied on him for money, his good credit, his company, and other things. I've felt as though I need to compete with her. Now that he has stood up to his mother, set some boundries, and realized some of the passive aggressive things she was doing... she does not approve of our relationship. She will not allow me into the house if she is home. She just creates all kinds of drama. She often kisses my boyfriends behind to try to keep him where she needs him. I asked him what is going to happen come thanksgiving, christmas, or if one day we do have babies. He said "well she's going to have to come around". As our move in date gets closer, our relationship gets stronger, and I just keep thinking about the holidays. Thankfully we all work some form of retail so those of you know what that's like... holiday's aren't typical holidays.
I guess I'm asking for some words of wisdom... a perspective... advice... really anything you have to offer me. Thankfully his dad is remarried and he has a good relationship with him. His mother has also been disassociated from her family, however they still speak with his father. Overall the mother doesn't have any close friends really, and she mostly hangs out with people in their 20's. Sorry for the long ramble! Sorry about the grammar! I also should add that I tried to take her out to dinner and she denied it. My boyfriend also tried to have a sit down talk with the three of us and she denied that as well saying that there are no hard feelings coming from her side and she loves her son and will be there for him no matter what. I'm confused because I tried to have dinner with her, I have done nice things for her, and she ignores me and refuses to have me around. What am I not getting? Will this ever get better? tl;dr... boyfriend of a year and I are moving in the end of the month... mother does not approve of relationship and now will not let me in their house... she has other previous disconnections with other family and claims this son is the only one she has left... will she ever come around especially for the holidays?