She turns 40 in a couple of weeks. You, your mom, and your son are all very nice-looking people. I'm sorry you have so many unanswered questions, and mean relatives who don't appreciate having you in their lives. It is their loss.
My story has some similarities but I've been luckier when it comes to relatives being close to me. When I was 12, an aunt told me the man I called Daddy (my mother's second husband) was not my father. I was glad, because he abused me. My mother confessed that she was pregnant when she married her first husband, so he wasn't my father either, although at first she lied and said he was.
I found out because after #2 died, #1 ran into her on the street and they reconnected, and he tried to start up a relationship with me. My mother dumped him and told me to forget it, he wasn't my father anyway.
I think I wrangled the truth out of her when she was in her 80's (she's 95 now). I was the product of a one-night stand in the French Quarter, the night before she shipped out with the Navy.
I like that story and I'm sticking with it. After all, who am I, and who are you? Just products of a thousand generations of people of all colors and backgrounds. I understand your wanting a medical history, but I've done fine without mine, and with luck, you will too. You could look at yourself not as the end of some unknown bloodline, but as the beginning of a long line of people who will keep good records and hand down the family history you're creating now, to your descendants. You and your son are a family. Some people don't have a son, or a mother. I have half-siblings (some are Trumpsters, ugh) and kids and grandchildren and even great-grandchildren. But their history starts with me. That's just the way it is.
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