Pest Control
The family called a pest control company, and the professionals located where the sound was, which made it easier to control where the pesticide went. This would hopefully kill all the rodents or cause them to leave, but they still didn’t know what it was.
A Haunted House
Pesticide didn’t resolve the problem, so the family wondered if their home was haunted. Whatever was inside should have died. It sounds unreal, but the family had no more options. Would holy water help? Could they stop the sounds in the walls?!