"My sibling’s fruit is all bastard grandchildren. Gov school ed brought morally bankrupt brokenness. "

The kids you describe as "bastards" were bastards before they ever set foot in any school. Sounds like the parents suffer from "morally bankrupt brokenness", regardless of what school either they or their kids attend.

I attended public schools and private Christian schools. There were literally bastard children who attended both institutions. Neither institution made them the bastards they were at birth.

Whatever school you choose to attend does not define what may be your inherent state of having been conceived by one's parents out-of-wedlock.