Conversation so far:
Does Stephen Stills have any children?
Stephen Stills' son Christopher was born in 1974.
Did Stephen Stills have any other children besides Christopher?
Stephen Stills' children were Eleanor, Justin, Henry, Alex, Jennifer, Oliver Ragland

Question: Did he have any additional children?
Self-contained rewrite: Did Stephen Stills have any additional children besides Christopher, Eleanor, Justin, Henry, Alex, Jennifer, and Oliver Ragland?