Just some extra information:
This morning, I started a brand new family.. the 'Tester' family, with Jacob, Helena and Ashton Tester as triplet toddlers. They are in a different house to the family I was playing that was having the issue, and aside from the issue with reading to the toddler (a known issue), I am unable to recreate the glitch.
The game that is having the issue was started in late 2024, and I have just completed the Legacy Leader achievement (before now going back to playing just one family throughout their whole lifespans), so there is a lot of data. I might make some changes to it, eg marking some of the families as NPC, cleaning up files, and see if the issue still exists. Stay tuned.
