Kelly, if you have water dripping through the ceiling...then you have had a leak for some time. It takes a good bit of water to breakdown that drywall to that point. I would ask the homeowner to get someone to inspect that area for mold and wood rot. Heck I'd even insist he get a termite inspection too. We had a similar leak in a closet ...in a rental house. The wet area attracted termites and they ate wood, drywall paper and books that were stored in that closet.