@mw1525 I rarely alter the look of my sims. I like them all to be unique. It's just that the two I changed their skin sliders for just didn't seem to fit into their families.
One of the reasons I reuse sims I made up to 10 years ago is because my style of making sims has changed over the years and adding them to my new games generates even greater diversity to the appearances of my sims.
I was a bit disappointed when it seems this skin doesn't appear to be passed on genetically. I have it in several different colours.
https://i.postimg.cc/7hLFJwGz/Crimson-FLower002.jpg
https://i.postimg.cc/5yFyhgXr/Wendy-Green-Flower.jpg
https://i.postimg.cc/nLvkJKDC/Gladys-Black001.jpg
I was guilty of changing the shape of the face of one of my sims once when I made him and his wife with dramatically different head shapes. She had a long narrow face and he had a short wide face. I experimented with 'play with genetics' and they produced a monster. The top half of the child's head was wide with a totally horizontal line across the bottom of that part of the head and a very long narrow jaw under it. I didn't get a pic as the sight was too terrifying. It looked like the child had been attacked with a chainsaw or something with its head sliced in half just above the mouth. Then a wide top of another head placed on top of the narrow jaw below. I think if the division between the top and bottom halves of the face wasn't so completely flat I might have gone with it.
The 'Perfect Genetics Challenge' I'm doing and making a video series is a different idea entirely. The point of that is to make a sim with distinctive eye and hair colour. And she has to have babies until she produces a child with the exact same eye and hair colour. That baby grows up to be the next generation and has to have babies until one has the same eye and hair colour. This goes on for 10 generations and then the challenge is done. In the challenge I'm doing, my founder and all of her heirs have purplish pink eyes and hair. The founder has pale blue skin - her husband is pale olive green skin and his hair is greenish too. The first heir has inherited her mother's hair and eyes, but she has her father's green skin. Plus, the founder and each heir has to have the 'Dislikes Children' trait.
This is my founder
https://i.postimg.cc/sDWmVR07/Olivea002.jpg
And this is the first heir. She's only a child so far in the challenge.
https://i.postimg.cc/3N3W2zFh/Cindy-Child001.gif