Sinjin is from a long line of Duskvol alchemists, apothecaries, chemists, inventors, perfumers, and physickers. With a history that goes back centuries in the city, the sprawling Blakely family is a respected name among those looking for medicines or doctoring. As with any large, old family, there have been ups and downs and the occasional black sheep, but on the whole the Blakelys are known as solid, honest, smart, and trustworthy folk in the medical field.
He practically grew up in his father's apothecary shop in Charterhall and was a frequent assistant on his mother's visits to the homes of those who can afford to pay for a doctor's services. Sinjin grew up wanting to be a doctor, like his mother, and has spent long hours studying dense, difficult medical and alchemical texts in preparation for attending university.
With such a large family, it is to be expected that not all are as respectable and well off as the rest. The family takes care of its own, though, and even those who live in Brightstone get together with their cousins from Silkshore or Charhollow. What's important is that they're all Blakelys, and even poor cousins are encouraged to apprentice with alchemist or physicker aunts and uncles if they show talent for it.
Sinjin has dozens of cousins around his age scattered around the city, and once he was old enough to be trusted to travel safely by himself he was allowed to visit with them as he willed. His cousin Eckerd has always been his favorite, and the two of them were practically inseparable as older children.
Eckerd went into his father's business as a mortician, though, while Sinjin prepared for university. Over the past few years, Eckerd has started associating with a rougher crowd and begun a side business providing corpses and organs for not-quite-respectable folks. Sinjin has accompanied Eckerd on a few of his trips to appropriate or sell illicit bodies or parts and has even started selling some alchemical items to people who wouldn't be comfortable coming to his father's shop.
While he is very busy with his studies, Sinjin quite enjoys the extra income from his side business and has been spending a bit too much time indulging his new hobby as a back-alley alchemist.