Who’s my dad 💭

I’m in my 20s and I still don’t know who my biological father is. My mom says it could be one of three people but that she isn’t sure. 😟 our relationship has always been rocky bc it was like she didn’t want me - I was always in and out of facilities and group homes as a minor bc she had allowed things to happen to me and she wasnt ever a protector. She was telling them I was acting out and doing things that weren’t true just to keep me locked away. Anyways here we are years later and she is helping my abusive baby fathers to try to keep my babies from me now as well. She is all around sabotaging and will not assist me with this and it’s running me up a wall. I’ve met one of them that she says it could be and he is bipolar - literally. He will go thru times where he will tell me he always wanted to be there but couldn’t due to his brain injury - jumping out of a truck on the hwy. however the time line for him doesn’t add up. My mom also says she had gotten taken advantage of by another man around the same time but she had to basically take the day after pill and she wouldn’t tell me more than his first name. And there is another man on my birth certificate different than both of them. She says this man did things to my brother and I so she left him and doesn’t want me having contact. I just want closure because not knowing my line of people is confusing me. I wonder if I’m out of line to start with the man she says is my dad - who is bipolar? Or if I were to reach out to the man on my birth certificate’s daughter and ask her if she would be willing to get a dna test. Or if I should ask the man himself? Idk what to do but this has been driving me up a wall the better of 15 years. Anybody went thru this or have any tips or advice? Thanks. 🙏🏽