Tony Abbott's daughter Frances Abbott has announced her support for marriage equality and urged people to vote yes in the national postal survey.

Despite her father being an outspoken opponent of the yes campaign, Ms Abbott posted a passionate statement in favour of legalising same-sex marriage to Instagram, alongside a picture of herself wearing a 'Vote Yes' T-shirt.

'YES PLEASE,' she wrote. "I don't really care much for politics. But I do really care a lot for love. All love is good. Let's celebrate it".