I think if a household gets deleted before moving out, it counts the furnishings in the home as their posessions and deletes those as well. I'm not sure whether or not the same thing applies when a household dies out naturally, but if it does then that'd be the answer. I think it's possible to enter the house in build mode, save it with all the furnishings, and place it back. Then you should be able to move into the house, with furnishings.
I will give it a try. I did go in it in build mode and everything was there. It just strange I have never had the option for furnished grayed out before. Thorne was not suppose to die until one of his other children aged up to teen. Orange adopted one of the girls the other three went to live with their mother. That surprise me as the time when Geoffery Landgrab died - some vampires adopted his daughter not the actual mother.
That's sort of a glitch. If you can't buy a house furnished, but the furniture is there in build mode, let a sim travel to the lot and then your sim can buy the house furnished.
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