I've been playing a new game in TS4, and here are some of the children I've had the original residents have so the world would keep their family lines in it. Nothing was changed in CAS on any of these sims except for one sim's name.
Jermaine Landgraab, son of Nancy and Geoffrey. He is already YA, since my game is in week 6.
Chadwick Goth, one of two twin boys that Bella gave birth to after she and Mortimer tried for baby. He's a teen.
Brennan, Chadwick's twin brother.
Jarod Lee-Scott, son of Liberty Lee and Travis Scott. Since his parents weren't married, I gave him a hyphenated name with the edit in CAS cheat.
In this game, I made Don Lothario have a child with each of the Caliente ladies.
This is Hillary, his daughter with Katrina. She's the oldest of Don's children.
This is Brynlee, Don's teen daughter with Dina.
This boy is Trevor Caliente, Don's son with Nina.
The Pancakes also had a bit of drama in their household. Early on, I had Bob and Eliza try for baby.
This is their teenage daughter Felicia.
When I went back to their household with the intention of making a second Pancake child, I discovered that during the game's random socialization on public lots Eliza now had a romance going on with Geoffrey Landgraab. Their romance and friendship bars were at the same or higher level than Eliza's were with Bob. So I decided to have Eliza invite Geoffrey over and try for baby with him, and see how that went. It worked (and Bob never got off of his video game long enough to notice what his wife was doing!) and Eliza later gave birth to twins.
One was a girl named Julia Pancakes, who is a teen here.
The other was a boy named Ezequiel Pancakes.