"What would you do?"

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I didn't think I would get this personal on MyLot, but would really like some opinions. (I'm not good at responding to all the responses, but I do read them all and appreciate them.)Okay, I was raised by my grandparents (in Canada) I grew up under the impression that they were my mother and father and called them that. I'm not sure how old I was but I remember finding out from a cousin that my older sister was really my birth mother. I didn't really seem to care I think, but long story short when I was a teenager I asked her who my father was and she gave me a few different answers- like oh I think he is dead, she said she didn't know, then she gave me a fake name. Long story short, when I had my own children I became really curious and sort of hounded her about it. She got really mad and defensive and gave me 3 names but said I really think its this guy. I'm not judging her but I actually got a picture of the one guy she really thought it was from doing some detective work but never spoke to him. Anyways, one of my sons has an illness and nobody else in my family has it and I would really like to know if it is hereditary.