When it becomes clear that spirits were conjured during the "dancing" in the woods, Abigail says that it wasn't her doing the conjuring, just Tituba and Ruth Putnam. ... After Tituba confesses, Abigail says that she, too, wants to confess her sins and come clean with God.
Not only should the children should be taking care of the Grandparents. Everyone should be taking care of everyone. That's how family works. They should be because, the Grandparents would (should) do the same.