In the Sorcerer's Stone, he got the Sorcerer's Stone from the vault in Gringotts
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Hagrid told him he was a wizard.
for Dumbledore
Lily Luna Potter, Harry's daughter, would have grown up knowing because all her family would be magical. Lily Evans, Harry's mother, was told by Severus Snape and it was confirmed by her Hogwarts letter. Somebody would have come and explained it to her parents like Hagrid did with Harry (only they thought he knew).
Rubeus Hagrid.
The Hogwarts gamekeeper (also known as the Hogwarts groundskeeper) is a Wizard employed by Hogwarts School of Witchcraft and Wizardry to tend to and look after the grounds of the school, as well as the security of Hogwarts Castle. It is Rubeus Hagrid.