Roger Williams-jeremiah and William-how are they related?

No

No, it's just a coincidence that there black, look the same, play the same sport and have the same last name....

Anson Williams is the second cousin of Dr. Henry Heimlich, known for the Heimlich Maneuver for treating choking victims. He guest starred in an episode of Boy Meets World in its third season as a...

yes

Yes. He is her grandfather.