I had in my third genaration parents only having one child just check family...
Teasea is 55 and Gregu is 53 and only had one child name Frella and she left them at the age of 5 or 6 I kept making them try for a baby and when they tried but each time no baby
Here are now too old to have another child and the last pic is there last chanch to have a baby but it never happened

Edit Teresa was adopted into a family in my second gen