Surprise parents and long-guarded secrets are tropes often found on television. Everyone remembers Jon Snow's (Kit Harington) "Game of Thrones" reveal that he was Ned Stark's (Sean Bean) nephew, not his bastard son as he first thought. U/Matthmil hypothesized the story behind Jamie's mother is similar and that his birth mother is quite possibly a Dutton herself.
"John also told Jamie that he begged Jamie's birth mother not to marry Garrett Randall because John knew what kind of man Garrett was. John Dutton clearly was close to Jamie's birth mother well before Jamie was born," the Redditor explained. "We also don't know Jamie's mother's maiden name. I propose that Jamie's mother's maiden name was Dutton. Phyllis Mary Randall was Phyllis Mary Dutton, John's sister." The poster goes on to back up this theory with many interesting supporting elements. John's resentment of Jamie could come from bitterness that Jamie's father took away his sister from the ranch, which ultimately killed her. U/Matthmil also pointed out that naming Jamie after the family founder could indicate he comes from the Dutton dynasty through blood. Other fans were quick to agree with this thought-out theory.
"Love this narrative," replied u/haroldhecuba88. "Strong theory and great insight. That's all I can say. You covered everything." Though some fans had follow-up thoughts, no one can deny that this would be information that would blow up Jamie's life.