I like what Nate Bota (last photo) had to say:

"Nate Bota, 16, shared classes with his fraternal twin brother Zach until they were in fifth grade at Pleasant Hills Middle School. He thinks kids should have some input on class placement along with parents."

"I know in elementary school I wanted to be [in my brother's] class, but if someone has a dad who is all about independence and wants to split them up maybe that's not what the kids really want and they don't get a say in it," Nate said.

"Definitely through middle school and high school, I liked being away from him in classes. We have one or two classes together now, which isn't bad. But I don't want to be around him all day because when we go home I'm still around him."

The kids should have a say. Why is that not obvious to the adults?

One way to look at it is that if they are apart, they will have more to share with one another at the end of the day.