Found My Bio Father But I'm Being Blocked From Him.

This is my 1st post so I hope I do this right. I need advice on what to do, if possible.
Growing up I always felt out of place. My mother was married to my "supposed father" and they divorced when I was 3. I have an older brother.
My "Supposed father" was a very emotionally and verbally abusive alcoholic who used to scream at me telling me my mom was a W, cheated on him, etc., and I was going to end up the same way.
I finally had enough of it when I was around 30. He would call me in a black out screaming at me so I went NC for many years.
Growing up my mother was also emotionally and physically abusive but whenever someone was writing an article about her, her kids were always doing wonderful in school, blah blah. (My mother had a local TV show and won an Emmy way back when). During that time the movie Mommie Dearest came out. I seriously was confused thinking it was about my mom.
That's the short story. Come now a little over a year ago I did a couple of DNA tests, one on ancestry and the other 23and me. Both came out that I was 50% Jewish. When I confronted my mom she said they were wrong and she doesn't know how that stuff works.
Well a week ago through another relative they mentioned who my bio dad is and thought I knew as it was an "open secret."
I did my research, called his son and explained the situation. Bio dad is 90 years old living in a nursing home. Both sons are attorneys. Of course son was surprised and said "He'd look into it." I'm sure they think I'm scamming them even after saying I want nothing but to know the truth.
I feel he's going to block me from meeting him and all that. I can't afford an attorney as I've been out of work for a year now (IT industry is taking a huge hit this year).
It hurts to know I'm an affair baby. I feel like I'm on the Maury show.
Where do I go from here? TIA