I went in and added extra beds to all available houses in the price range and extra cribs, just to be safe, and getting the same thing. But yeah - these are all 1 person and 3 person families, with more beds and cribs than necessary.

I've hunted for any mention of this, but no dice.

I have Awesomemod installed and no other core mods. I have plenty of affordable housing within the price range for my sims, but whenever they try to relocate I get 'failed executing findhome.' They're in the homeless bin, with ample fundage to move, and they try to move every few sim hours, but no dice. All houses have cribs and there are plenty of homes in their price range. Am I missing something exceedingly obvious?