Demolishing a house

Thanks @Cinebar . I do need some clarification. First, there is no glitch or any known problem with the house. I just designed it poorly. Secondly, Why do you never move a Sim into a previously lived in house? I had always thought I could safely move my graduated college students into houses the parents had moved out of when they got more money and moved into bigger houses. So basically you are saying that once a family moves into a house, they should just tear down and rebuild on the same lot instead of moving into a larger place/lot?

If that is the case, I should probably restart my city. Playing the way I described above, many years ago, I thought I got to generation 6 being born with no problems. But I lost that computer hard drive and thus my saved game. I don’t know if it would have eventually gotten corrupted. My goal is to get to at least 10 generations or more. I like growing my city organically from scratch.