If the gags are to be believed, the chances of a husband getting on well with his mother-in-law are next to zero.
But if the psychologists are to be believed, he really ought to try.
Husbands who get on well with their in-laws have a 20 per cent higher chance of avoiding divorce than the average, an American study found.
Weirdly, however, women who enjoy a good relationship with their in-laws have a 20 per cent greater chance of separating.
The researchers suggested that wives who like their in-laws may find it hard to set boundaries, and in the coming years may feel they are meddling. But men don't seem to share such anxieties.