So I created this sim, named Katie. She likes to uh, sample the local flavor shall we say? :-) She's had on and off affairs with several premades and has had quite a few offspring as a result. I will share photos here.
Katie, the mom:
https://i.imgur.com/J6LT4GR.png
Jett Lothario, son of Katie and Don Lothario:
https://i.imgur.com/vZfiRwu.png
David Goth, son of Katie and Mortimer Goth:
https://i.imgur.com/t0OLtq4.png
Jack Huntington, son of Katie and J Huntington III:
https://i.imgur.com/bntSwkh.png
Amelie Huntington, daughter of Katie and J:
https://i.imgur.com/jbu24Y4.png
Nicholas Goth, son of Katie and Mortimer:
https://i.imgur.com/YfPpP0F.png
Nixon Goth, twin of Nicholas:
https://i.imgur.com/0pPSYRA.png
Blake Lothario, son of Katie and Don Lothario:
https://i.imgur.com/lnVqia8.png
Ansleigh Zest, daughter of Katie and Johnny Zest:
https://i.imgur.com/j37J1gn.png
Aislynne Zest, twin of Ansleigh:
https://i.imgur.com/nCEn7wi.png
Jett, David, and Jack are all young adults in the photos, Amelie, Nicholas, Nixon, and Blake are teens, and Ansleigh and Aislynne are child age.
Some observations:
Jett looks like the male version of his mother to me. David is a carbon copy of Mortimer but with his mother's hair color. Jack looks just like J except he has his mother's lips. Amelie looks like J except for her mother's eye color and lips. Nicholas resembles Mortimer more but has his mother's eye color and prominent cheeks. Nixon has mostly his mother's features but still has the Goth coloring. Blake looks like Katie and Don but I think he favors Don a little more. Ansleigh and Aislynne look like they are going to look a LOT like their father, and I think the way they look makes it pretty obvious that Johnny Zest definitely has Landgraab genetics (the girls look like they could be Landgraab children to me).
At least with Katie, Mortimer, J, and Johnny all seem to have pretty strong genetics, whereas Don, not quite as much.