I play on PlayStation so it's definitely not a population mod issue for me. On my current save my sim is the last kid of 27 of her family which are all still living in Henford cause I used science babies and cake aging so I should be seeing her whole lineage around out and about. All 26 of them. They are either adults or young adults removed from her family tree because you can't have parents younger than their child thus making most of them random Townies that should fill the worlds. I used to see them everywhere but now I don't.