Dear Queenie,
My older daughter got divorced because both she and her husband had an affair with another man and woman, respectively.
My younger daughter is happily married, but I found out that sometimes her husband has sex with her sister, my older daughter, and the younger one knows about it and even encourages them to do it. Her argument is that this way her husband is not so likely to cheat on her.
Queenie, should I try to do something about all this, and if so, what should I do?— Worried mother
Dear Mother,
Apparently your younger daughter and her husband do not believe in the “forsaking all others, keep thee only unto him/her” part of their marriage vows.
It is naïve of your younger daughter to think that this arrangement will keep her husband from cheating on her. Just the opposite is more likely to be the case.
As for what you should and can do: tell your daughters – as gently as you can manage – just what you think about all this (including what I have said, if you wish to quote me) and hope (pray!) that they will listen to what you say.