A descendant of the Nandor, Tinion was born in the realm of Lothlorien in the year 1981 3A when Celeborn and Galadriel returned and became the Lord and Lady of Lothlórien. While growing up, he dwelled on a flat in Caras Galadhon, the City of the Trees, where he became very loyal to Lord Celeborn. Celeborn considered him as a son and saw in a vision that he would one day become the new Lord of Lothlórien after he departs to the Undying Lands. In 2509 3A, Tinion married Uruviel, a loyal maiden to Lady Galadriel. Together, the two gave birth to a daughter and named her Ernoviel.