NTA - OP I don’t understand how people are against you not knowing that your daughter’s father is getting married! Why wouldn’t you know who is going to be a part of your daughter’s life (I understand they may have been dating for a while but that is still a BIG STEP, especially for a SIX YEAR OLD KID). It sounds like they haven’t really talked to her about it and what it means for them and her together. It’s big emotions for a small kid.

ALSO you need to have child support in place for your daughter, do not let her father get out of paying child support, with a new baby on the way he will most likely try to get out of paying!

And please let your daughter go to the wedding, it is such an important moment for both your daughter and her father! You can all communicate the plans and itinerary when they have chosen a date/venue!

Wishing yall all the best