Hey there, welcome to the inZOI forum!
We’ve had a few reports like yours before, unfortunately. The major issue is, that for whatever reason the game sometimes doesn’t list married Zois as being one shared household. I put your save file in my setup and noticed exactly that. The female Zoi is part of the household living on this lot, while the male somehow becomes a different household (you can check this by looking at the “family” category on their Zoi card). The only known fix to this issue is going to the neighborhood selection and adding your male Zoi to the household by “moving Zois between households” option.
This is vastly part of the known issue mentioned here: