The 100-year-old actor, said the mutual passion for acting repaired their relationship which was fractured after Kirk got divorced from Michael's actress mother Diana in 1951 when he was just seven years old, reported The Guardian.
"Michael didn't like me much after his mother and I got divorced. It was only when he started acting that we became close," Kirk said.
Kirk married Diana in 1943 and they had another son together, American film producer Joel, 70.
When asked if he ever felt competitive with Michael, Kirk replied, "No! Only proud.
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