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The winning candidate’s mother in Selby and Ainsty said "never say never" on him becoming PM.
Jill Tambaros said Keir Mather was named after Keir Hardie, who founded the party, and is also the forename of the current leader.
Her son has become the youngest MP in the House of Commons after winning the North Yorkshire seat.
Sunak says next election not a done deal after Uxbridge by-election win