Ron Parker is the stepfather of Ben Parker, the patient in the Season 8 episode Parents. He was portrayed by actor Kovar McClure.
Parker was under the impression that Ben's biological father had died from melanoma. However, he's shocked when his wife later reveals the father is still alive and she doesn't want Ben to know.
However, as Ben gets worse, Ron reaches out to Ben's biological father so that he can say goodbye to his son before he dies. His ex-wife throws him out, but House realizes the biological father is suffering from syphilis and that he molested his son, giving him the disease which is now killing him.