i came up with an idea for a mod that replaces all the premade sims in oasis landing with descendants generated from sims in non-active households, but i have no clue how to even start figuring out if this is actually possible, so i was hoping someone with more modding expertise had already made it, or could at least give me some tips on how i might be able to create it myself (if it's even possible.)

I just double-checked, and Nraas Traveler does this. More details of how it works here.

@G-Mon: i'm not looking for a mod that alters the descendants system, i'm looking for a mod that gets rid of the pre-made families in oasis landing and replaces them with descendants generated from non-active sims in my town, because i doubt every single town somehow results in the existence of the Planeson family in the distant future.

I think what you are looking for would be VERY hard to accomplish. There prob isn't a mod for what you are trying to do.

@Persian: actually, i think i might be able to do something similar to what i want to do using the NRAAS mods.

Great! I hope it works out how you want it to. Good luck