I know how frustrated you are I can see it in your typing
Perhaps if your nephew gave Harley a treat each time he were
over Harley would look to him as friend not enemy. His biting
has to be corrected for sure. Bud has done that once on me
and nearly lost his ears! Who knows what goes through their heads but they are tough little ones. Try the treating thing maybe at least
twice each visit. Good luck.
Carol & Buddy