So, the choice in fetishes is usually experience related, like personally developed in response to your environment, and not hereditary. But there might be some hereditary element to your susceptibility to develop a fetish of some kind. Genes do play a role in how your brain is "wired" up. I suppose I have a fetish as one who loves to fight other women. But I can assure you that my parents have no such fetish. They may well have a fetish of some kind that I do not know about. Indeed, I am certain that they would be horrified if they learned that I was into fighting and do fight others.