They Showed Up at High School?

This has been the case in my game from almost the beginning 😊  But it was because of a mod specially for this, back then.

Now it is like this too, but not having said mod anymore 😊

But in my case most likely it is combination of other mods (home regions, townieoverhaul) , that my high school only has sims from my other households. 

Anyway, happy to hear its like that in your game now 😊

It is great that the teens from your first household were also attending the school, when the teens from the second household were there 🙂It is very nice that you can now build on this for the future of two of them, with them meeting whilst attending high school together.

Hey! Someone who has made the ultimate NPC making guide!

Fun fact: as noted here, not any teen appears in the high school. In order for a teen to appear in high school lot, they need this trait: trait_HighSchool_Active_Class1Student. Despite the name, the teen can also appear as Class 2 student.

I'm guessing there are two ways to obtain that trait through gameplay:

1. Follow your teens to high school at least once.
2. If there are not enough teens in the high school, some random teens are given that trait.

Yes, it was simply perfect in two ways. 1. It was unexpected and, 2. It allowed me to set their friendship level for them to take things to the next step.

I think I know what mod to which you alluded to. I tried it, but it never worked for me. More experimentation is needed, I feel, to prove this is a thing, now.

I did follow the boys to school once, but that was in a different save. This is a brand new save I began. I just happen to place the same families in it. Previously, no ties were between the two families.  I hadn't had the chance to set the friendships between the two sets of parents, let alone their kids. Sometimes, it's as if this game reads my mind . . .  

I'm guessing option 2 must be the impetus.  I had to evict two households in Windenburg --- I needed both 64 X 64 lots. As far as I know there are no other teens in this town. Maybe that's all it is.