McCartney expressed his desire in a reply to a question posed by a Brazilian fan who asked the singer, "What would you do if you had a time machine?"
"Go back and spend time with my mum," said McCartney.
McCartney's mother died when he was just 14 due to an embolism. Her loss later became a point of connection with Beatles founder John Lennon, who lost his mother when he was 17, reported The Telegraph.
Previously the 70-year-old singer has spoken movingly of how his mother inspired one of his greatest songs 'Let It Be'.
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"It was lovely. I woke up with a great feeling. It was really like she had visited me at this very difficult point in my life and gave me this message - 'Be gentle, don't fight things, just try and go with the flow and it will all work out'," he added.
"So those words are really very special to me... Things did get better after that but also, in putting them into a song, and recording it with the Beatles, it became a comforting, healing statement for other people too."