Contrary to the researchers I don’t believe that reporting of ‘a good In-law relationship’ by the wife also means she suffers from meddling In-laws. I doubt she would have called the relationship good then.

I rather fear that darker forces of nature are at work here. A woman can only have so many kids in a life. I have heard of cases of 14, but say 8 is more like the natural upper boundary. A man, however, can have nearly unlimited amounts of kids – as long as he involves more than one woman. So, the parents of the wife have an evolutionary interest embedded in their genes that prompts them to foster the stability and wellbeing of their daughter’s marriage. Because the kids she will have in this marriage are likely all the kids she’ll ever have; she can certainly not increase the number of kids infinitely by divorcing and re-marrying younger men. It’s the opposite for a man: in theory, he can increase his prospect of children by divorcing and re-marrying a younger woman. Somewhere his parents must also ‘know’ this in their genes and have an evolutionary urge, however little, to nudge their son along…

So, when in doubt, celebrate the next holiday at her parents’ rather than his..