While "The Chamber of Secrets" gives us a little of Hagrid's backstory -– specifically his time at Hogwarts and how he was expelled -– it isn't until "The Order of the Phoenix" that we get to meet one of Hagrid's relatives. Tasked by Dumbledore to gather some allies for the Order's fight against Voldemort's Death Eaters, Hagrid travels to find the Giants, and in the process manages to find his half-brother, Grawp.
Towering over Hagrid at around 16 feet tall, Grawp makes an instant impression on Harry, Ron, and Hermione when they are introduced to him, seemingly unaware of his size or strength. In a wise deviation from the books, where Grawp has a propensity for violence, the films depict a much sweeter Grawp with a childlike innocence that is a stark contrast to his imposing size. After their initial shock, the trio soon comes around to Grawp, agreeing to look after him should Hagrid be called away.
Grawp doesn't feature in the films as heavily as he does in the books, making just one appearance in "The Order of the Phoenix," however, he certainly makes a big impression in a short space of time. He shares an adorable bond with Hermione, who, after her initial chastisement of him, becomes one of the few people who cares for Grawp in the same way Hagrid does.
