DanaePlatinumP You can actually place new lots in Edit Town, without needing CAW. The Add Any Lot Size mod (compatible with whatever else you're using) may be useful in that context:
https://modthesims.info/download.php?t=471164
You'd need NRaas Tagger to give the new lots their own addresses.
But if that's not enough, and it may not be considering the size of the SV map and the number of descendants you're considering, it may be better to use either an updated version of SV or a different map altogether. You could use NRaas Porter to import the SV sims to a new world without them losing the relationships outside their households, if those matter to you.
