Can't Change BxB

Need to read The Switch for this to make some sense.

My boys are back, but this is about their kids.

Ethan and Andy came into the lives of Andrew, Evan, Drew and David.

Andy was Drew and David's adoptive son, and Ethan was Andrew and Evan's. But what happens when Ethan starts to feel something more for Andy?

What happens when he starts to fall in love with the boy who was growing up seeing Ethan as a family member and nothing romantic? And the worst Ethan is sure Andy isn't gay.