Canon 53 A godparent may not marry the child's widowed mother

Since kinship according to the spirit is greater than the union of bodies, and we have come to know that in some places certain persons who receive children from holy and saving baptism afterwards contract a marital cohabitation with the widowed mothers of those children, we decree that from the present nothing of the kind be done. And if any, after the present canon, should be detected doing this, first let such persons separate from this unlawful cohabitation, and then let them also be subjected to the penances of fornicators.