Absolutely - a teacher who now has a class with some confused kids who only have “revolutionary new” information shared aloud by their peers, should be able to take that moment and teach the fact that a LARGE portion of society does not have family units with exactly one Mom & Dad, and be free to explain (age appropriately) a few scenarios how this (initially) confusing situation can come about, and that those are all perfectly “normal” families as well.
Being allowed to factually teach about our society should not start at grade 13.
In fact - just two weeks ago I posted a commentary by a Florida HS student now attending college in NY - and their experiences with coming from a state with “mandated blinds” on: