Ilberic Brandybuck was the son of Seredic Brandybuck and Hilda Bracegirdle. He was born in T.A. 1371 and when he died is unknown. He had two siblings; Doderic (older) and Celandine (younger). There are no records of a marriage or children.
Not before the fourth draft of the Brandybuck genealogy was Ilberic added but with the name Alberic. In the final and published genealogy he was renamed to Ilberic.