Adulthood: Hard to say. She seems to spend much of her time in Shadow, but disappears from view for long stretches. There are only two places she could be during these times: the Primal Pattern or the Courts of Chaos.

Name: Shannon
Amber Parent: Delwin
Normal Parent: Tellura
Shadow of Birth: Unnamed Shadow with Greek architecture, modern clothing, democracy, and Renaissance technology
Childhood: Displeased with all the men she had thus far encountered, Tellura latched on to Delwin as an appropriate father of her child, as she had no interest in marriage. Once he left, not knowing she was pregnant, she bought a home atop a mountain plateau to raise her child and study science. She did so, and discovered Shannon shared her interest in science, though in different fields (astrology, study of birds, geography).
Adulthood: Shannon kept the home up even after her mother's early death. When Tsia arrived in the Shadow, she recognised Shannon as her sister and took her into Amber, to the Pattern. Shannon only walked it because her sister was there urging her on. She then returned to her home Shadow, and has stayed there since.

Name: Tavin
Amber Parent: Caine

Normal Parent: Grace
Shadow of Birth: Amber
Childhood: Twin to Barda. Raised by their mother, although they did see Caine fairly often. Very interested in the techniques to running a business, but also in such other activities as thievery and assassination.
Adulthood: Currently runs an organization of some sort; its exact purposes are unclear, but it is definitely illegal in Amber. His sister acts as his bodyguard. He has apparently walked the Pattern at some juncture; exactly when is unclear.

Name: Thorne
Amber Parent: Gerard
Normal Parent: Janice
Shadow of Birth: Bios
Childhood: Raised in and around boats and wharves. His mother was captain of her own ship, a fact which Gerard did not know until later. She was also a very shrewd woman, something Thorne learned from her. She was also quite aware that Gérard was a Prince of Amber.
Adulthood: His mother was lost at sea, but not before she used ties in Rebma to sneak her son into the Palace and to the Rebman Pattern. He had not met his father at the time of Gérard's death. After his mother died, he got control of her ship, the Bedlam, and took up her business -- that of borderline piracy.