My mom won't stop misgendering me...

For context, I'm 43, mtf. I came out last June and started HRT last July. So we're talking nearly 15 months now. My mom lives with us and helps take care of the kids and whatnot. She's been super supportive and all that, but she continously misgenders me. I correct her all the time and have even had talks with her saying that it's been over a year and it's starting to really irk me when she does it. But it doesn't help. 95% of the time she refers to me as her son and uses he/him. I'm at a loss on what to do at this point. I'm getting upset about it now which isn't helping. Any suggestions?