Zero even talks like MX and has similar mannerisms. People have said that maybe he studied up on MX. But blood relatives, even ones who have not lived together, often have similar mannerisms and speech patterns.
I am sure MX is the bio-dad.
Now the question should be, who’s the mother.
How right you are. My brothers wife divorced him when his son was like 3 yrs old. My brother never saw him until he was in his 30's or older. Neither did I, but when I saw him he had exactly the same mannerisms as his father, my brother.
I vote for Malcolm X as Obama's father also.