This is one of the best theories I’ve seen about Jamie’s mother, nice job OP
So, you’re thinking that John and Jamie have equal claim to that ranch? And John doesn’t want Jamie to know that? That would be freaking brilliant! This would explain how John knew Phyllis so well.
And would explain the birthright comment Garrett made. That has bugged me since I heard it. Birthright implies it’s something Jamie was entitled too because of his birth parents.
May also explain John agreeing to adopt Jamie when he didn’t really want to, if he is actually a blood Dutton. Or was it a ploy to bolster his own inheritance?
I hope the lawyers weigh in on this post. It would be interesting to see how the courts would treat this. Can you adopt a blood relative and disinherit them?
Edit: adding another thought; could Jamie already know?