Generation Warriors is a science fiction novel by Anne McCaffrey

Anne McCaffrey

Anne Inez McCaffrey was an American-born Irish writer, best known for her Dragonriders of Pern series. Over the course of her 46 year career she won a Hugo Award and a Nebula Award...

 and Elizabeth Moon

Elizabeth Moon

Elizabeth Moon is an American science fiction and fantasy author. Her novel The Speed of Dark won the 2003 Nebula Award.-Biography:...

. It is the third book in the Planet Pirates trilogy

Planet Pirates Series

Planet Pirates Series is a Science Fiction paperback book series created and written by author Anne McCaffrey beginning in 1978. An omnibus edition The Planet Pirates was published by, McCaffrey, Moon, & Nye in 1993.-Series:...

 and continues the Ireta series initiated by McCaffrey in 1978

Dinosaur Planet (novel)

Dinosaur Planet is a science fiction novel by the American-Irish author Anne McCaffrey.It was a paperback original published in 1978, by Orbit Books and then by Del Rey Books , the fantasy & science fiction imprints of Futura Publications and Ballantine Books respectively.A sequel followed in...

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Summary

The title character from the first book of the trilogy, Sassinak teams up the main character from the second, her great grandmother Lunzie, to end the threat of the planet

Planet

A planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,...

 pirates. (Granddaughter and grandmother are the same age because of relativity stasis induced by cold sleep.)