Ser Galen

Mark Vorkosigan
... He is created in a plot by Ser Galen, a Komarran terrorist, to replace Miles, assassinate Miles' father Aral and Emperor Gregor Vorbarra, claim the Imperial Throne, and foment chaos and ... Mark, after he kills Ser Galen (who had become both his tormentor and father-figure) refuses, and goes his own way ... Mark could be considered Cordelia's son, Miles's son, or the son of Ser Galen, depending on how the circumstances of his creation are interpreted ...