Moving on....or at least trying to

[MichelleLT]

But if he's not actually asking for custody to change, just a change in the parenting plan (or if he backs off and just asks for an addendum to the parenting plan about sending him to the out of area school): "The court stated that the father's requests to alter the parenting schedule and the child's school situation did not amount to a request to modify the joint custody arrangement." (which means the standard is best interests, not the changed circumstances rule). Enrique M. v. Angelina V., 121 Cal. App. 4th 1371 (Cal. App. 4th Dist. 2004)

Either way, your points are
1) best to stay with other siblings cuz of close relationships
2) school has better test scores
3) school is the one he should be attending based on geography
4) school is safer
5) more convenient to have 2 kids at same school