Are trevor and Leslie Howard related?

Leslie Howard was born Leslie Howard Stainer, whose parents were Hungarian and not English. Trevor Howard was born Trevor Wallace Howard-Smith, whose father was English and mother was Canadian. There...

It Depends. If you are referring to the renowned actor/director who starred in "Happy Days," then, no. Assuming that you mean Ronald Howard, the actor who played Sherlock Holmes in the 1954...

no

Ken Howard is not related to Ron Howard. Ron Howard's father is Rance Howard.

Yes, Bryce Howard is Ron Howard's daughter. Now you know why she gets great acting opportunities. Her daddy is also a director.