Alison, just a point of interest regarding claiming off your neighbours insurance.
You notify your insurance, they assess the damage and conclude how it happened then claim the money back off the the other persons insurance. If the other person is not insured they claim off the person, if they have no means of paying that is the insurance companys problem not yours. A water damaged ceiling is obviously caused by an upstairs source so I can't see any way that her BIL could concoct a story to stop you claiming.
Sorry, but I think you have been taken for a ride on this one.
You notify your insurance, they assess the damage and conclude how it happened then claim the money back off the the other persons insurance. If the other person is not insured they claim off the person, if they have no means of paying that is the insurance companys problem not yours. A water damaged ceiling is obviously caused by an upstairs source so I can't see any way that her BIL could concoct a story to stop you claiming.
Sorry, but I think you have been taken for a ride on this one.