Both the children and the Centauri woman are members of Emperor Londo Mollari's household, and all got there through murder. Luc and Lyssa are the niece and nephew of Urza Jaddo, whom Mollari killed in a duel in Knives (1995). Senna, the Centauri woman, is the daughter of Lord Refa, whom Mollari had assassinated in And the Rock Cried Out, No Hiding Place (1996). In both cases, Mollari took the children of his victims into his family.
According to Babylon 5 canon, Senna later marries Vir Cotto. When Vir becomes emperor, she reigns also, as empress.
According to the novelization, Jankowski later committed suicide. He left a note which said only, "On my head,". He meant that he foresaw his mistake being the reason for humanity's extermination.
Although he receives "Special Appearance By" credit, Michael O'Hare (Jeffrey Sinclair) only appeared through archival footage taken from And the Sky Full of Stars (1994).
According to the novelization, Jankowski was later offered to the Minbari to prosecute and punish as they saw fit. The Minbari rebuffed the offer.