Someone help!!!

My boyfriend and i have been together for 6 years now. When we go to any family events on his side, his mother never takes pictures of us together, but will over load the pictures of his 2 siblings and their significant others. She will take lots of pictures of him when im not beside him also. She doesnt like me huh? I've tried to talk to him about it and he seems to get mad or say shes never said anything like that! Anyones thoughts?