he does not have a middle name it is just Rubeus Hagrid
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Hargrids only known brother, the giant, Grawp after the battle and defeat of Voldemort probably settled into life working at Hogwarts in Care of Magical Creatures. But you would probably get a more accurate answer from J.K. Rowling herself.
Hagrid's half-brother Grawp survives the battle of Hogwarts. though you do not find out what happens to him afterwards.
Hagrid's Mother. She is a giant and had relations with a wizard but she then left him to care for Hagrid and had relations with another giant giving Hagrid a half brother called Grawp. In OOTP Hagrid says that he was told that she died years ago.
Rubeus Hagrid won the dragon's egg in the Hogs Head pub in Hogsmeade. The pub is owned by Aberforth Dumbledore, brother of Albus.
Rubeus Hagrid was created in 1997.
Going by the epilogue, we can assume he is at least still the keeper of grounds and keys (Harry reminds Albus that Hagrid wishes to have tea with him at his cabin) and may still be the teacher of Care of Magical Creatures.
No, Hagrid was always on Dumbledore and Harry's side. Hagrid was very loyal to Dumbledore and would not have betrayed him.