Television
Ryan Sinclair is introduced in the eleventh series premiere, "The Woman Who Fell to Earth".
Ryan is a 19-year-old living in Sheffield, England who is training to be an electrical engineer while working part-time as a warehouse worker. He was raised by his paternal grandmother, Grace O'Brien, who recently married his step-grandfather, Graham O'Brien. Grace worked as a nurse, and met Graham while he was undergoing chemotherapy for cancer, about three years before they met the Doctor. Ryan and Yasmin Khan were in primary school together, though at the time they didn't know each other very closely.
Ryan has dyspraxia, a coordination difference that impacts his motor skills. Though his symptoms are relatively mild and high-functioning, it affects his sense of balance to the point that he finds tasks like riding a bicycle extremely difficult.[1]
His father, Aaron, a marine electrical engineer, made an appearance in the 2019 New Year Special. Aaron has been absent most of Ryan's life since the death of his mother, and was also absent for Grace's funeral.