I went to bed and now I’m back by unpopular demand with more headcanons. Giyuu is designated passenger princess so that means Sanemi teaches all the kids how to drive which means being stuck in a car for many hours with him. He’s surprisingly a decent teacher when he’s not road raging himself at the other idiots on the road. He teaches them to drive, including how to drive backwards, warns them about car jackers and how to repair stuff so you don’t get scammed by a mechanic. Basically he teaches them how to drive the same way I was taught.