His grandma 👵🏻 😐

So my boyfriend has been living with his grandma for a little while now (helping her with bills and such) anyways, I usually go over on my lunch break and on weekends or whenever i can. Sometimes shes there, sometimes she isn't. But i just get a feeling she doesnt like me. I feel bad when im there with him alone in the house because i dont want her to feel like im disrespecting the house or maybe she feels like we're being sneaky or doing stuff. But she has also been kinda weird around my daughter, but my boyfriend says "well shes going to be my daughter too" because he has a daughter already too.. i feel like she feels like we are taking his daughters place or something but i feel like she just doesnt like me for some reason?? Idk