Boyfriends mum

So my boyfriends mum is disabled and obviously I get she needs help but it seems to be whenever he’s about to see me and i know she hates me she’s not good at hiding it and it’s making me go crazy I wanna see him on the weekends but I can’t get one full uninterrupted weekend with him she calls about three times and sends paragraphs when he doesn’t answer her texts straight away what do I do