I am looking for the title of a 80's horror movie I saw years ago! It was a rather scary movie about a family (I think) who was captured by a strange family in a house or on an island.

I remember a scene in which the leading girl pretends to be as insane as the spooky family in order to stay alive, after the rest of her family has been killed. They bring her to a barn where dead people are standing or hanging on the walls. Instead of screaming, the girl claps her hands childishly and cries out something like '...even more dolls for me' or something!

I know this sounds a bit vague but does anyone know the movie I'm talking about?