Rubeus Hagrid visited with his long-estranged Giant brethren in Harry Potter and the Order of the Phoenix, in an attempt to recruit them to battle Voldemort. When "talks" broke down, Hagrid returned to Hogwarts with his half-brother Grawp, a rather unruly creature.
Asked in an online chat:
What will happen to Hagrid's half-brother?
J.K. Rowling: You'll find out in book six. Luckily he's become a little more controllable.
(Source: Online chat transcript. Thanks, Sniv.)
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