I dunno. I was tempted to wait until Insiminator or SimPE is updated but from what JM said about them being irreversibly corrupt I'm not sure if I want to try. I'm definitely not awesome enough to repair character files. I wouldn't even begin to know how to use the rollback or blank template techniques. I'd also hate to find that there was something else FUBARed with the Ottomas. I'm finding myself leaning toward a tragic family death. They could be the first residents of my Riverblossom Hills Cemetery.
This is basically an unresolveable problem. What happens is that when the game crude-splices this family into your neighborhood, it doesn't correct the token data. Therefore, while in the template hood, the pregnancy token contained the correct NID, when they're added to your neighborhood, they get new NIDs. As a result, the NID of the father from the old neighborhood now belongs to an arbitrary sim instead.
They're basically irreversibly corrupt, and you should use either the rollback technique or blank templates.