This is why Grandpa John doesn't want Todd and me living with him.

TOKYO (AP) - Police on Tuesday questioned three siblings after it was discovered they had been living with the decomposed corpse of their father for nearly a decade, an official said.

Police found the body of Kyujiro Kanaoka lying on a futon bed at the family's home in Itami city in Hyogo prefecture in western Japan, said a prefectural police spokesman, who declined to be identified.

Kanaoka's three elderly children, all in their 70s or older, told police they thought their father was still alive but that one of them recently had consulted a relative about the possibility that he might be dead, the spokesman said.

Police were investigating the cause of Kanaoka's death. Judging from the condition of his decomposed body, Kanaoka may have died as long as 10 years ago, the spokesman said.

Had he been alive, the man would be 107 years old. Hyogo prefecture had registered Kanaoka as its oldest living resident, public broadcaster NHK said.