The young men from Labrador can't keep cool in the middle of a severe winter. They skate on the ice, attired simply in bathing suits, and plunge repeatedly into the icy water. There is no faking in the picture. Can't-believe-your-eyes authenticity of film is found in HER NEPHEWS FROM LABRADOR, a lighthearted story as a vehicle for two New Rochelle residents, Billy Noel and Ed Brady. They were locally famous for the antics they portray here without stunt doubles and without any deception: ice skating in their bathing suits and swimming in an icy pond in New Rochelle's Hudson Park.