You never answered the question about the parents that are divorced. Or having adulterous relationships. Or the single mom living with her boyfriend. Does the school ask each parent what sins they are currently involved in they have not repented for? If not why not? You see where it gets foggy?
Answer this .... If this was your childs school and they knew of all your secret sin would your child be at school this morning?
This school does not enter into an isolated relationship with the girl and a separate relationship with the "parents." The school makes it clear that they enter into relationship with a whole family.
And by her open support for her "parents'" lesbianism, the girl has just made the school's case for them. All three disregard God's command to repent.
"Repent, for the kingdom of heaven is at hand."
I'll answer that for you, even though it is against my better judgement. The school is, after all, doing EXACTLY what it should do--handling each student individually. But since it seems to be a sticking point with you...
Therefore, the school requires that at least one parent be a confessing Christian and active in the local Christian church.
Sorry, I don't see the fog.
Is it possible that not all of the parents are being forthcoming with regard to their sin? Of course that is possible. If it came to the attention of hte school administration, I would expect them to handle that instance the same way they are handling this one. In this case, both the mommies and the daughter are unrepenant. Instead of facing their sin, they are filing a lawsuit. I don't understand why you are championing their cause.