Is Elsa the Dutton's Mother?

Elsa Dutton - John's great aunt

As John Dutton Junior came into the mix, Elsa is Costner's character's great aunt.

Who is Elsa to John Dutton on Yellowstone?

Elsa is John Dutton Sr.'s (played by Audie Rick) sister. As for John Dutton (played by Kevin Costner in Yellowstone), on the other hand, she is his great aunt.

Who is John Dutton's mother?

John Dutton Sr., originally known as John Dutton, is a main character in 1883: A Yellowstone Origin Story. He is the eldest son of James Dutton and Margaret Dutton of the Dutton Family. He is one of at least three John's in the family, the others being his son, John Dutton Jr., and his grandson, John Dutton III.