Welcome to the Forum, funkywallace!
I'm not sure that what you're trying to do is technically feasible.
But if the result you want is for the household you're playing to be in the same town as the household your wife is playing, this is what I would suggest:
1. Save a copy of your household to the Gallery. They will keep their progress in skills and jobs and will keep their relationships within the household. They will not keep their personal or family inventories.
2. They'll have only $20,000 (plus an extra $2000 for additional family members), so you might not be able to move them directly into the house they lived in before. Move them onto an empty lot.
3. Use the freerealestate cheat or money cheat to move them into the house they were in before.
If you made a lot of changes to a pre-existing house, you can also save that to the Gallery and then move it into your town.