[quote="CatholicNerd, post:1, topic:219260"]
Laudetur Iesus Christus!
My best friend from childhood on (he himself has never married or attempted marriage)has announced his intentions to marry a woman who has recently become divorced from her husband. As far as I am aware, all three parties in this situation are baptized protestants of some stripe or other... I have made it clear him that I will be happy to attend his wedding if he can prove that no marriage existed between his desired spouse and her "ex" husband. Obviously, the only definitive proof would be a declaration of nullity from a Catholic tribunal.
Here's the thing: he's willing to obtain one, if he can. Will a diocesan tribunal even acknowledge the request of two protestants? :hmmm:
Non-Catholics are not bound by the Catholic understanding of marriage unless they attempt marriage with a Catholic. In that case, they have to demonstrate they are free to marry according to our understanding of marriage. Otherwise, our tribunals aren't going to address what is the business of their church authorities to ascertain.
Protestants do not believe in bigamy. Your friends, according to the understanding of marriage within their denominations, are free to marry. That is why the church they are approaching would agree to marry them. Neither are you bound to hold them to our understanding of marriage. Otherwise, you would not only have to be certain that the woman in question was free to marry but would also have to be certain they were following other aspects of canon law with regards to marriage, including that they had a validly-ordained minister. (If the minister they choose to marry them is a woman, are you going to walk out?)
Satisfy yourself that the woman is free to marry according to the understanding of their own denominations, and then attend or don't attend accordingly.