If they wish to go to Holy Communion and are not living chastely then they really can't. If they continue to live together but chastely then they can go to Holy Communion. They can do spiritual communions. Only God can really judge their situation but the protection of the sacrament and the authority of the church has to be respected. It is a great cross but if accepted with love and they continue to pray and live out their Catholic faith as best they can God will respect their situation. He is a God of Mercy. It's a problem these days that everyone seems to think they are entitled to receive Holy Communion even if they don't go to confession. The person who foregoes this gift because they accept they are not in full communion with the church displays humility and reverence and God's mercy will be there for such a person.
9 I tell you that anyone who divorces his wife, except for sexual immorality, and marries another woman commits adultery.” Been thinking about this passage. I have this vague memory of reading one time that Our Lord’s comment ‘except for sexual immorality’ referred to the man ‘who divorces his wife’, in which case He is reminding His listeners (and readers) that the man has already committed adultery regardless of whether he goes on to marry another. It seems tautological, on the face of it, but Our Lord knows what we are like and was ensuring that He was going to leave no loopholes. Perhaps, the passage would read less clumsily in the original Aramaic, or in the Greek or Latin. At any rate, The Church always took the view that divorce and remarriage was always forbidden. It was the Orthodox (later on) and the Protestants that (conveniently?) misinterpreted this passage.
I think the gist was that, regardless of whether the man marries again, he is forcing his wife to commit adultery, since a woman of marriageable age without a male around was usually in a very bad spot.
