More than a third of Labour voters say they would be upset if their child married a Conservative.
The number was twice as high as the amount of Tories who said they would be upset with a Labour son or daughter-in-law.
Data from polling agency YouGov reveals that 34 per cent of those who identify as Labour voters would be upset if their child married a Tory.
Over a tenth of those said they would be “very upset”.
Just over half, however, said they would “not be upset at all”.
The number of thos who would be upset with a Conservative son or daughter-in-law has risen six percentage points since January when 28% told YouGov they would be upset in the same situation.
Only 13 per cent of Conservatives say they would be upset to some extent if their child tied the knot with a Labour supporter.
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Only two per cent of Conservative parents saying such a marriage would leave them very upset.
There are similar divisions when it comes to Brexit.
Nearly forty percent (39 per cent) of parents who voted Remain in 2016 said they would be upset to some extent if their child married someone who had opted to leave the European Union with just under half (47 per cent) saying it wouldn’t upset them.
On the flip-side, just over one-in-ten parents (11 per cent) who backed the Leave campaign said they would be upset if their child went on to marry a Remainer, with the majority (78 per cent) saying it wouldn’t upset them.