Towards the end of The Woman in Black (2012), Arthur Kipps finds the dead body of the child in the marshes, and he places his dead body into his grave. I thought the grave should have been empty, but there was another corpse (in skeleton form) in that grave. Whose corpse is that?
The child's mother.
The reason Arthur went through all that trouble was to reunite the two since her ghost was possessing/killing all the children. Also, Arthur's son was on his way to town. He'd hoped it would chill her out.
But no, ghost was just as crazy as the one from The Ring.