I have two kids at two schools! It is rough on me but awesome for them. DD9 is in the gifted school nearby. It is a public school and wonderful. She is thriving there. She is well liked, learning, making friends, her teachers enjoy her, she is well known. We thought that it would not be fair to ds7 to have to follow in her footsteps. We have a feeling that he would always be dd's little brother there.
So! DS7 goes to his own school where he can just be ds without being someone's little brother.
It would be nice for ME if they were in the same building. Just one PTO, one set of volunteer hours, one place to drive to in the mornings, same school holidays, etc. They are both getting exactly what they need educationally and emotionally, so I am pleased.