Tywin kept their lands. King Jaehaerys II was old and sick, and given that the Crown Prince and Tywin were BFFLs, no one was going to do anything about it.
EDIT: Sick, but not old.
This is kinda building off the previous ask about Harrenhal, but what do you think happened to the fiefs of Castamere and Tarbeck Hall after Tywin eliminated their families? It seems like bad precedent for the crown to let Tywin keep them after straight up murdering everyone, but at the same time he seems unlikely to give crucial territory over to the Iron Throne.
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