Everything else aside I think Barb is gone. They're going to see her condition (which, as far as we can tell is pretty bad), her losing her senses, her at the very least having her only caretaker being this...thing. The state they would have found the house. I can't see any scenario where they just drop her off at the house and Chris opens the door.
Unless Barb is A LOT better physically and mentally than we have seen through the few clips (which is possible, we don't know much), she's gone=house is gone=chris is....?