Is there such a thing as a mod that allows children and teens to attend school even though they're grounded? I'm getting tired to having to use testingcheats to teleport them outside so that they can catch the bus. Either my Google skills are fading, or I'm just not looking hard enough.
You'll be kicking yourself over this one!
NRaas Story Progression mod. It allows you to set the curfew times.
I have definitely seen things about curfews in the menus for SP.
Alternatively, if you don't want to do it via SP, you can apparently ask the parent who has issued the grounding to forgive the kid, or you can make the kid do a bunch of chores until they are forgiven. I don't have Generations (I am presuming that this is where the grounding comes from) but I read somewhere about this bug of not being able to go to school and that was the solution put forward.