I don’t recall any specific Biblical commandments about what to do with corpses. Traditionally they’re buried, but that varies depending on circumstance. Keeping remains in a teddy bear in your house, however... Odd, for sure, but nothing in the Bible condemns it.
The Bible does speak about cremation. Check this link out.
http://executableoutlines.com/top/cremate.htm
Keeping ANY remains in the house is weird. So far, we have collected one dog and one brother-in-law. I doubt if my wife will add her husband to the collection, though.