How to make traits genetic?

I'm brand new to modding, so please forgive me if this is something easy. I've tried to find tutorials or people talking about similar things, and while I've found plenty of tutorials on how make hidden traits or gameplay traits, I haven't found anything on how to make those traits pass to offspring. I found the trait tracker injector mod by MAL22 that can be used to change inheritance rules, but I don't know how to use that to create my mod. I want to make a mod where if Parent A has "X" trait and Parent B has "Y" trait, offspring will automatically inherit both "X" trait and "Y" trait-- which I think I'll make a gameplay trait so that players can chose which trait(s) to assign to what sim.

Does anyone have any tutorials or guides for something like this that they've come across? Or any advice they could give?