Aha! For try #11, I left Inteenimator installed and created a new family in a neighborhood created
after installing Nightlife and Open For Business. Made 'em married and moved 'em in. Got 'em jobs a the local science lab. Got her pregnant in the usual way. Played for three days.
Result:
Randolf and Martie Estwich with their daughter Maddie
Conclusion: There is something rotten in Xanadu.
That is, there is something unique to my N008 Xanadu, where the game-crashing problem occurs. It might be a compatibility problem between Inteenimator and babies conceived before installing all these things, but I have a few other things to look at before I can say that for sure.
That was the neigborhood where I was trying to beat Rose's record for having a sim father the most number of babies. I just might have found the limit. Stay tuned!