I have a question about divorce and remarriage. Suppose you have to non-catholics who divorce and one of which marrys again (to again, a non-catholic). How are we supposed to view the remarriage as catholics? For instance, my wife and I have Christian friends who are in a second marriage of 18 years. Are we to conduct ourselves as though they are or are not married (or something different altogether)? Like if they were to stay at our house after a long travel, would “allowing” them to sleep in the same room be considered sinful to my wife and I? Furthermore, would celebrating their anniv. be sinful? I know this happens all the time in the real world, but I can’t find any information on this topic.
Thanks in advance!