Something similar here. Sims don't know their spouses. I suspect it's part of the social overhaul to fix the friends issue from the last update.
I kept getting "Get Married To" and "Get Engaged To" whims for my sims to their own spouses.
When I went to make the next generation for the neighborhood, Play With Genetics didn't work correctly.
If I picked an adult, the spouse was not available as a mate. (Though other sims were. So a sim's mother-in-law could mate with her, but not her husband.)
When I picked children I could create a sibling. Both parents of the child showed as parents of the sibling.
Opening up a household, I discovered that spouses did not know each other. Introducing them to each other did not solve the Play With Genetics problem. They still could not mate.
Moving a spouse out of the household then back in did not solve the problem. (I thought it might re-introduce them.)
Using cheats to set the sims relationship to romantic. Ditto using cheats to set the relationship to married.
Introducing the sims after setting the relationship did not work.
Play With Genetics works fine for the new families in Windenberg and new households I create. I just doesn't work correctly for the existing households.
