Elless
I think (hope) everyone is taking this too literally and KazzaSJ doesn't actually mean to be present at the actual birth, just to see the baby soon afterwards.
I also think readers have missed the point that the GF is intending to let her family be involved and see the baby but not KazzaSJ's family. That's what I interpret which, understandably, is upsetting.
OP says ‘ we are not even allowed to be present at the actual birth.’ Seems very clear to me.
It is quite common, where I live anyway, for the pregnant woman to want her mum there. I was at one daughter’s delivery, but not her second because of covid. My other daughter has just had her first, and I couldn’t be there also because of covid.
I’ve never known of anyone wanting MIL there, no matter how good the relationship.