Not a debate, we just don't know how this works?
my brother (Christian) is engaged to a Catholic girl. we don't really know much about the religion. they've talked about maybe an outdoor wedding. and she's also mentioned a catholic service. will a catholic priest do an outdoor wedding? or marry them at all since my brother is not catholic?
I have been to weddings where a Catholic Priest did the ceremony outside of the Church but is it not a full Catholic Mass, just a vow exchange. Most who want a full Catholic Mass have the ceremony in the Church.
The Priest will perform the ceremony even though your brother is not Catholic. He most likely will want them to pledge that they will raise the children Catholic.