Yellowstone prequel 1923 concluded with Alex giving birth to a son three months early, who she named John after Spencer's brother, leaving fans wondering how he fits into the Dutton family tree

The Dutton family tree is pretty complicated, but it doesn’t have to be. Yellowstone, 1883 and 1923 fans will appreciate this easy explanation of how James, Jacob and John Dutton are related. The end of 1923 seemingly locked into place who Kevin Costner’s John Dutton’s grandfather is.

Yellowstone prequel 1923 has come to a harrowing end and it saw Alex (played by Julia Schlaepfer) give birth to a son three months early. The trauma of her perilous journey had forced her body to reject the baby and it was believed the boy would not survive.