This is YN

YN's Biological Mother Female Sauron

YN's Biological Father Talion

Adoptive Father Zeoticus Gremory

Adoptive Mother Velana Gremory née Bael

Adoptive Aunt Grayfia Lucifuge

Adoptive Sister Rias Gremory

Adoptive Older Brother Sirezechs Lucifer

YN has all of both of his Biological Parents Powers and Abilities
YN's Ring of Power it has all the Powers and Abilities of the Nine Nazgul Rings and his mother's ring of power his Ring of Power is also his sacred gear the Dragon of Enslavement

YN's Morgul Blade

YN's Mace