July 9, 2026

Genetics Overhaul Collection: No Weird Age Up and Random Genetics (Preview)

Finally I made one of the most challenging and wanted projects I planned to release. This mod collection provides completely another genetics system.

This module remakes all CAS templates to set way more strict randomization limits for various sliders. And just to be clear, the same templates apply on your Sims when they age up.

And yeah, I fixed one of the most annoying things – small chins. It turned out, that the game can't randomize the chin sliders upward, but instead is encouraged to apply the lower values. That's why small chins are generated way more often and appear even if your previous generations had normal chins.

But that's not the only change! I set up the lower and highest limit of eyes, lips and nostrils size; eyes, nose and mouth positions, eyebrows angles, shoulder length and a few more sliders I forgot to mention.

Of course, you still can see an ugly NPC, but it will occur much less often. Besides, it's often not because of the sliders, but because of the presets itself. That's why I recommend to use Presets Selection for Randomized Sims by SimplyAnjuta – this mod excludes the ugly presets from the NPC randomization.

Check the compatibility status HERE

REQUIRED

Nothing, Base Game compatible

CONFLICTS

With mods that change the Client_CASModifierTuning files. Doesn't conflict with MCCC

TRANSLATION

Not needed

Installation

Put in the Mods folder

DOWNLOAD

HERE (07.08 in Public)

This mod has longer Early Access because it's a very complicated mod and I want to test it more carefully. I hope you understand.

Also, this is the most difficult thing I have ever made, so I'll be very grateful if you decide to support me 🙏

OTHER MODULES

All modules from this collection are independent and don't conflict with each other

Main Mod

Better Inheritance

I can only help if you provide me with the details of any issues you are experiencing – so 'It doesn't work' won't help at all. Read THIS before writing a bug report (via the link below, not in the comments section). And please read the FAQ section!

Contact me | Buy me a Coffee | Bug Report | Mod Status Sheet

Comments (34)

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Sherberry · July 31, 2026

Hi. I wanted to ask because it says the mod is public on July 8th but I still have to unlock and pay to access. Did I miss something? I’m just very confused

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SonozakiSisters · July 31, 2026

Hi, it will be in Public on 7th August

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GreenPepper · July 25, 2026

游戏更新到1.126.报错了,救命 TVT...

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SonozakiSisters · July 25, 2026

Please write in English

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Nigeria Gardner · July 23, 2026

Hi just wanted to see if you would ever consider doing a preteen/tween mod that has the child sim "age up" to preteen/tween and become a bit taller with an auto height slider turning them into a preteen/tween they would still slightly look like a child but be a bit taller. there's a preteen mod but it take teen sims and de-ages them into preteens using an auto height slider making the teen sim shorter which makes them look like short adults rather than preteens.

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Maddie Kay · July 22, 2026

OMG LOVE! I would totally upgrade, but dont get paid until next week. When will this be public, if you dont mind me asking? Thank you!

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SonozakiSisters · July 23, 2026

Thanks! It will be public on 7th August

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OONana · July 21, 2026

Thank you for this interesting mod. I'm wondering, if I manually set the hair color and eye color for the parent sims in the trait panel, will those settings be automatically inherited by their children?

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SonozakiSisters · July 21, 2026

You're welcome! If you manually set color, then this color will be considered on creating offspring's genetics. That's why you can change hair and eye color, not affecting genetics

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SlytherinQueen2531 · July 20, 2026

As soon as it becomes public, I will definitely be downloading it. It will be nice to have my sims actually looking like they are family. Especially with the grandchildren being born in my current save file.

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SonozakiSisters · July 20, 2026

I hope you love it 💖

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GreenPepper · July 20, 2026

使用这个模组需要翻译吗?

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simagrestegamer · July 18, 2026

Is it compatible with version 1.124.63.1020? :)

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SonozakiSisters · July 20, 2026

Yup, you can check my mods status table, there is a link in the post

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Linda Dunmire · July 18, 2026

OMG THANK YOU!!!! We all NEEDED this!!!

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SonozakiSisters · July 20, 2026

You're welcome 🤗

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ThtOneSimmer(Mo) · July 10, 2026

I thought it was supposed to go public July 8th ?

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gab · July 11, 2026

7th of august, only usa uses the mm/dd/yy system ^_^

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Black Paradise · July 10, 2026

If my financial situation improves—right now it's just so-so—I'll support you fully <33

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SonozakiSisters · July 12, 2026

Thank you so much 🙏

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Black Paradise · July 10, 2026

At the very least, it would be great to have a mod that lets Sims age from childhood to adulthood and then just stop—unless you actually create elder Sims, in which case they’d age normally, haha. Or I don't know... I’m also really hoping for fresh vampire mods—new types of bites, new romance options, and so on. I feel like the supernatural creatures didn't get as much attention as the Sims themselves.

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Lineyakitty · July 10, 2026

You could have aging on but then flag your Sims to stop aging with mccc when they hit the age you want them to stop. Or you could change the lifespan settings and make those ones really long in comparison to the children's ages.

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Black Paradise · July 10, 2026

The only thing missing is the mods in Spanish, hahaha.

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SonozakiSisters · July 10, 2026

I think someone will definitely translate it in Spanish :)

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Black Paradise · July 10, 2026

It’s just awful when all the Sims you create age and lose the look you spent so much time crafting. I know you can stop aging for everyone—both active Sims and those you aren't currently playing—and that you can still have babies, but of course, the babies don't grow up... It’s a mess; there’s no balance, or else Sim lifespans just need to be longer.

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SonozakiSisters · July 10, 2026

I play with disabled aging, but still I have to remake everything when I advance age of my Sims 😭

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JoJo · July 10, 2026

I changed the percent variation for genetics in MCCC will this mod affect that?

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SonozakiSisters · July 10, 2026

The MCCC settings will apply the variation boundaries after my mod work Of course, it won't mean anything for a slider which for I turned off randomization entirely

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EmmaCarg94 · July 9, 2026

Hi! Are all of your other mods compatible with the latest updatE?

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SonozakiSisters · July 9, 2026

Hi, they are You can check my mods status list

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missmaya · July 9, 2026

It says it will be early release 07.08 ?? Shouldnt it come out today

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SonozakiSisters · July 9, 2026

No, today I just released it. On 7th August it will be in Public

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uuuwwuuu :3 · July 9, 2026

I do have to wait for it to go public, but I promise I absolutely will be downloading the minute its public! Thank you so much for bringing something to this game that has caused so much frustration on my end and I'm sure a bunch of others. Truly, thank you!

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SonozakiSisters · July 9, 2026

Thank you too! I was so frustrated by the dull genetics system of TS4. But recently one of my Sims got pregnant and it motivated me to make several biological mods for a new family member ;)