Then it's probably the axe.
Backup the game, move it to the family inventory, then move.
I will double check to see if this is the only sim that gets stuck. The last time I had this issue I had been able to move one family member out then it stopped letting me unless they got married. And that worked on all but an imaginary friend turned real (I ended up letting him starve to death since he wouldn't remember to eat and just yell that he was hungry, I think I laughed when Grimm finally came to collect him).
I do have pangu's axe, it is currently hanging on a wall of the house. Again, the last time I had this issue I also had the disappearing pangu's axe glitch where it took it from the inventory of the sim who was carrying it and put it in the family inventory. However it wouldn't let me see it when I put it on a wall to reclaim it until I did a complete uninstall, deleted all save games and started fresh... again...
Then it's probably the axe.
Backup the game, move it to the family inventory, then move.
