Tree Dorman was said to be Amaya's partner and another blacksmith.
Background[]
They were apparently a romantic couple/partners at one point during Graham’s past.
Gwendolyn comments that Amaya didn't need a partner, she was a strong woman by herself. She believed Tree Dorman was underdeveloped.
Ultimately, Tree Doorman was disconnected from the Stories (KQGS) Graham specifically chose to tell about his life (as he skipped over the 20 year period between his 30s and 50s).
Behind the scenes[]
In the concept art Amaya is shown as starting to have wisps of grey hair thus suggesting it takes place roughly ten years after chapter 3, and ten years before chapter 4 (in the lost chapter period when Graham was in his 40s).
While 'partner' could be used in the business sense and not relationship sense, however, concept art also describes them as the “blacksmith couple” (in same way Hobblepots are also described as a couple), and they are holding hands in a romantic way, which further makes it look and sound like “partner” is intended in the romantic sense. Gwendolyn’s comment could be taken as a double meaning towards romantic sense as well.
If they are romantic couple/partners it would beg the question how Whisper fits into this history? Is it a love triangle (or is Tree Dorman perhaps a pet name for Whisper)? At least in what Graham and Gwen’s discussion implies he is separate character altogether, left undeveloped.