Answer:
I'm really not sure why the buyer would want to keep the statue of the seller's dead mother in the premise, it sounds creepy, but he/she entitled to do so. The statue is probably considered a fixture of the house, mansion or premise however you want to call it. When someone sells a property, he/she must include all the fixtures, e.g. doors, windows, pool. A fixture is something that is physically attached to the property.
If the seller plans to remove some fixture, e.g. an expensive lamp in the living room, he/she must state so before closing the deal and the buyer must accept it (generally it would be included in the contract).