Billy Jayne
William Billy Jayne is an American actor, musician, director, and producer. He has been in many films, and has sometimes been credited as Billy Jacoby. His siblings, Robert Jayne, Susan Jayne, Laura Jacoby, as well as his halfbrother Scott Jacoby are also actors.
Jayne was born in Flushing, New York on April 10, 1969. At the age of three, he was visiting his older halfbrother Scott Jacoby on the set of That Certain Summer, for which Scott later won an Emmy for Best Supporting Actor. The director needed someone to play Scott in flashbacks, and Billy was selected and began his career.
Source: Wikipedia