Recently I mused on the subject of In-law relationships for the newly widowed person. Do these relationships continue after the death of the law-link through the married person ? Many of us agreed that these relationships might continue if there is some continuing monetary give and take between ex-in-laws; otherwise, NO. Here is a somewhat related question. The custom of cross-cousin marriages exist in several cultures in the East as well as the West [& I suspect in the other two directions as well]. Cross cousins and Parallel cousins refer to the children of our parents' brothers and sisters (parents' siblings). Here is a picture <source> that shows the relationships: [EGO is oneself, circles are Females, and Triangles are Males. Father's Sister's children, and Mother's Brother's children are cross cousins]: "Cross cousin good; parallel cousin bad" is the basic rule in cultures that approve of such marital matches. Of course the other factors (age appropriateness, education, money, liking one another, etc..) would be applied as well. In the ancient collective family living schemes, cousins would grow up knowing full well who-is-marriable and who-isn't. In modern times, when nuclear families live far apart, even in different continents, such cross cousin marriages are still going on. If there has been a cross-cousin marital link, and one parent of the two is widowed, the relationship transactions between the families would still continue....even without any money give or take, to whatever extent that is feasible. I have known a few cross-cousin marriages in my extended family/clan. The children of the marriages have gone on to have lives as normal/ordinary as others born to those that had married thoroughly outside the family. Do you approve of cross cousin marriages ? : your son or daughter marrying his/her cross cousin ? Are you married to your cross cousin ? I should have added another question here.... fortuitously, still in Edit-time: You find out that your child/sibling is seriously thinking of marrying someone who is the product(scion) of a cross cousin marriage: Worry, Act, or Ignore ?