Is ocd hereditary/genetic? Because my sister and mom have it (I think they have different types)

can i get OCD from GAD dad???

I bought some books on OCD because I like education and would like to know a little more behind why I feel or think this way. I opened up to my mom about this and she keeps saying I’m obsessed with having OCD, she doesn’t actually believe I have it, and that I forced myself to have those thoughts. She then told me she’s going to ask her mental health provider (she’s a nurse) if you can give yourself a mental illness because she said there’s no way someone could spiral out of control within a few days the way I did.

Does it happen to you that when a person is specific in your ocd thoughts (my sister is my sister), that everything about her is a trigger for you when you see her? And the way he moves, talks, eyes, you suddenly sexualize everything, or is it just me? it really bothers me, because I constantly feel my groin, so I wonder if it's really OCD, or if it's something in me...