Prologue
Max and Phoebe are six when they are taken. Six years old when they aren't allowed to go home. Six years old when their parents are not allowed to find them. They are six years old when they realize the only family they have now is each other.
Hank and Barb's children are six when they are taken - and they aren't allowed to do anything.
"If Max and Phoebe are as powerful as their reports say, they will come home." The president of the Superhero League tells them; and they are angry.
"They are our children!" Barb screeches and the superhero league nods. "We know. But Max and Phoebe are twins; they are powerful together. Go ahead, and go home. Wait for the children."
They allow three searches over the course of three years (then, Hank and Barb have Billy.)
"You've got another superhero child who needs you. Not a person who's caught up with finding other children." The president says, giving them meaningfully looks.
So, they decided to move. They had Nora and Chloe after Billy; and they left Metroburg. Maybe if they'd realized that their twins would come back, they'd stay.
But, instead, they moved away. And that was okay - because they had three children they needed to take care of. And they did take care of their still-there children.
But then the twins come back. And things begin to get weird.