[FIXED] Skintones Don't Work With Genetics (CAS or in-game)

@SerenaBeanieHaving the same issue in vanilla-game [no mods]. With one parent being very dark-skinned and one being very light-skinned the children come out favouring the light spectrum of the skin tones. Very few could be described as a mid-tone of the two and none favoured the darker spectrum

EDIT: I wanted to add a video clip showing the problem but the forum doesn't seem to allow it.

Hello @NhimSim 

It would be great if you could share the video file with me, if you are willing to share instructions are here.

There are different options of sharing files mentioned in the link above. Please feel free to DM me.

Here's the link [I hope it works] https://drive.google.com/file/d/1OJsyrwV1p57PGcWQez_d2rbXYViMlxpn/view?usp=sharing

This was a new attempt with the parents having the lightest and the darkest neutral skin tone. The kids turned out all having the same very light skin tone

Dad, Mom and daughter

I tested this with various Sims of different skin color (saved with "old" skin colors and new created with "new" ones). I changed the places between mom and dad or mom/mom and dad/dad. I had NEVER a dark toned child! Sim genetics are broken for darker skin tones.

I asked about this problem on twitter. https://twitter.com/heyob32/status/1336081127518433280

Although the Sims account said that a middle skin tone is picked, I am having a problem where it appeared only the lighter tone was working in CAS. I generated a child for a couple twenty times and each time the skin tone came out very light, even though the father had a dark, neutral skintone. Other replies to my tweet show that the problem is showing up in other games and different combinations of parents and skin tones.

I tested in CAS with all undertones.  Warm gave me a middle-ish (but on the lighter side) tone for the offspring - but it was the same exact skintone, no matter how many times I tried it.  Both Neutral and Cool used the same skintone as the lighter skinned parent with every single attempt.

I'm having the same issue!

Another problem is when you play genetics having a Sim with ligther skin and other with darker skin. The lighter skin will take over and you will be unable to have kids with darker tons.

I tested and that was the result I had using these 2 Sims.

Two of the kids have something between, but not darker than that.

The variety of skins we have are very limited for wheel of color I used on them both...

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Rarely (0% - 9%)
What is your current game version number? 1.69.57.1020
What expansions, game packs, and stuff packs do you have installed? Discover University, Get to Work, Seasons
Steps: How can we find the bug ourselves? Uncertain. In my save, a Sim is pregnant with twins in a household that currently has 6 members. I have been able to reproduce this by loading a save from earlier in this Sim's pregnancy.
What happens when the bug occurs? The twins are born. The first born twin looks normal, but the second has bright red skin in his portrait. However, as a Baby, he looks normal, with the same skin tone his twin has; the redness is only in the portrait. On aging up to Toddler, however, the child with the red portrait now has red skin.
What do you expect to see? I expect the child to have a skin tone more like his parents and siblings, not bright red.
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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His twin and his older brother both have expected skin tones; all 3 children were conceived and born after the skin tone update, and only the one has this issue.

Edit: Pictures of the relevant Sims.

The parents.

The older brother.

The twins as babies. Note that one (the twin in the pink bassinet) is red in his portrait but not in-game.

And... the twins as toddlers.

Game Version: 1.69.57.1020

Platform: PC, Win10

Expansions: Get Together, Get To Work, City Living, Seasons, Get Famous, Vampires, Parenthood

Confirming the same issue and it seems repeatable 

Repaired game in Origin after updating, just to be safe, so doing that wont help

First, I tested in CAS with no mods

2 parents father lightest cool skintone, tweaked slightly with sliders to be lighter, mother darkest warm, tweaked slightly with sliders to be darker & warmer. Generated 6 kids using genetics, all of then randomised at least 4 times, all 6 had same skin tone which appears to be somewhere between to the lightest neutral and their fathers skin tone. Skin tone never changed during randomisation.

Tested again in game in fresh save with the same parents, only mods used MCCC and AllCheats to speed up things. 6 kids, all from natural try for baby, labour induced with MCCC and then caked to childhood. All 6 have same very light skin tone which appears to be their fathers skin tone

Here's a screenshot from in game (excuse the terrible clothes & makeup, everything was randomised). Will saves or tray files be needed?

EDIT: Repeated the CAS bit with the same result, so its definitely repeatable, at least for those skin tones. Recorded it this time. here's a link to the video,

https://drive.google.com/file/d/1G75WNM0ldReuhnt-wbx-fUgKfJwK2kNT/view