My second query, followed by Cardinal Burke's reply:
Is it acceptable for a couple not validly married and with offspring for whom they are responsible to argue that, for the good of that offspring, they may lawfully continue to live as husband and wife because it may prudently be foreseen that their relationship, if not sustained by adulterous intimacies, would fail to survive?
A couple who are living in an irregular matrimonial union may argue that they must continue to live under the same roof for the sake of their offspring, but they must live without recourse to adulterous acts, that is, they must live as brother and sister. In other words, the need to live under the same roof for the sake of children or elderly grandparents is not an argument which justifies acts of adultery. Both reason and faith tell us that adulterous acts can never be justified, can never serve the good of either the parties or of their children.