Well, you can tell him that in year 7, 8 etc, in PHSE days where you think they are being told about sex education, they may well also be being told if they feel uncomfortable about their body, perhaps they are actually a person of the opposite sex trapped in the wrong body. If the kids pursue this idea (v easy on social media, TikTok, etc) and announce to the school that their gender is wrong and they now want to be referred to using different pronouns, etc, then the school will most likely do this without telling you, the parent. It’s possible that they will also go through a load of sessions with the school councillor where they discuss being trans, and the school will not challenge this in any way (be kind - be affirmative) and parents will not be told. The kids can go a very long way in terms of getting affirmation from the school, from peers, and certainly from online communities before you have any idea about it all. You will be the last to know.
Within schools, there is a mix of staff who will have bought into the ideology and some who feel powerless to fly in the face of such righteousness and political correctness but who would dearly love parental support to bring challenge to the ideology. Such people will welcome your GC support.
Close friends of ours learnt this the hard way. Far better to bring light to it as a bunch of GC parents so that the issues can be aired publicly and discussed. It is no joke having to help your child unpick their gender issues when you only discover it a year down the line and it is horrifying to know that has been enabled by the school who at best fear being discriminatory by not going along with it and at worst have staff who actually believe for example that men can be women by growing their hair, wearing dresses and makeup, taking puberty-blocking drugs, growing breasts and having their male genitalia removed.
Wouldn’t your husband prefer to know what the school’s approach will be? Wouldn’t he prefer for there to be some guidelines that parents were aware of?
It’s absolutely brilliant that you are doing this by the way - good for you. Schools need parents to make their concerns known so that each member of GC staff is empowered to put their foot down and make a stand.