WIBTA for not wanting my bf’s mom at his appointments?

I (24F) have been with my boyfriend “Karson” (25M) for 2 years now. We’re very happy together and I want to start this post off by saying that I love his family, especially his mom. She has accepted me into the family with open arms and goes out of her way to incorporate me into every event. Which is why I need to know if I am being an A-hole…

Unfortunately, Karson was diagnosed with stage 4 cancer six months into our relationship. He was living in his college town, which was 2 hours away from his family, so I moved in with him to take care of him. He went through hell for months while doing intensive chemotherapy. And while I worked full time and supported us financially while he was out on disability, I also was the primary caretaker. I used all my PTO for every surgery, every infusion, every appointment. And it was all worth it, not only because I love him but because he deserved it. That man deserves all the love and peace this world can offer.

His mom would travel to come with us to the appointments and infusions, which I was completely understanding of. He is her oldest son and she raised him by herself for a majority of his life. With that being said, she is not very medically inclined. I work in healthcare and am very well versed in the terminology, protocol, and expectations. So often times, when Karson would have questions about anything not answered by his doctors, he would ask me. And/or, he would want me to advocate for him and his conditions when we’re at these appointments; seeing as i’m the one who was there with him day in and day out.

Fast forward to now, he is in a period of remission (thank you God). Most all of his appointments and scans are for surveillance purposes and/or routine lab work. We still live 2 hours away from his family but his mom still insists on traveling to come to these appointments. Part of me is understanding, but another part of me feels a little undermined as I am the woman of his life. We’re not engaged yet, but I know he has a ring so it’s only a matter of time until we’re married. I just wanted to throw this out here to be humbled if I am in fact the AH…