My girlfriend and her father are too close?

She is very hot, and whenever I meet her father I feel like I am not her boyfriend and I am just a bodyguard or a ordinary friend

I talked to her and she said that after her left, he took care of the family. And she helped him as a daughter. But I think it is weird the relationship they have, she is sleeping in his bed, she is making food for him during the week and she has distance with her other brothers. It's like everyone accepting her as the mother in the family. She hugs him a lot and I don't know why but they look like a couple.

Her father is very attractive and in good shape and train a lot and I just can't understand what this relationship.

My girlfriend and her father are too close?
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