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In the show, Willem and Martyn Lannister, Kevan Lannister’s twin sons, are killed by Rickard Karstark and some others as revenge for Rickard Karstark’s two sons dying in season three. In the book "A Storm of Swords," Willem Lannister and his cousin Tion Frey (Genna Lannister’s son) are killed. Martyn Lannister is still alive.
The showrunners probably just didn't want to have to explain that Tion Frey was half Lannister.