The Vorkosigan Saga is a series of science fiction novels by Lois McMaster Bujold.  The series is centered around the life of Miles Vorkosigan, a native of the planet of Barrayar, but two novels feature his mother Cordelia Naismith Vorkosigan, one (Falling Free) is a loosely-connected prequel set a couple of centuries before Miles's birth, and one (Ethan of Athos) features one of Miles's comrades, Elli Quinn.  The novels (and a few novellas) were not written in chronological order, and even now are not always published that way.  Recently, they were rereleased in a series of omnibuses.

In chronological order:

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