Not sure ... what do you guys think

So I've been with my boyfriend for 5 years and I feel like his mother and sister doesn't like me. Everytime I go to there house i would say hi and I get nothing in return. So today I was in his house waiting for him to come back from running errands with his mother and sister. His grandmother was in the house so she sat on one side of the livingroom in a single seat and i was sitting on the other single chair they have but where I was sitting has a place I can put my feet up so I didn't think anything of it and put my feet up. I've done it before.so, they get in and the first thing his mother says is oh look at me sitting on the couch very comfortable in my head I'm like I'm expecting a hi how are? ect. But nope his sister comes in and as always doesn't say a word as if I was invisible. How should I feel? Please let me know if I'm over reacting or not