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The late comedian Les Dawson made a career out of jokes at his mother-in-law's expense, including one memorable wisecrack that he was upset about her funeral because 'she's cancelled it'.
However, it turns out that he may have been on to something.
A study has revealed that people really are more likely to have friction with their partner's mother than with their own mum.
Les Dawson at 'The Royal Variety Performance' TV Show in 1991. He made a career out of jokes at his mother-in-law's expense
Researchers in America found the most common reasons for a row with mothers-in-law were about money or criticism of how their grandchildren were being brought up.
The scientists believe people may be unconsciously biased in favour of their own mothers due to a 'genetic conflict' that makes them act unconsciously in the interests of their own kin.