Ego the Living Planet

Ego the Living Planet is the father of Peter Quill, paternal grandfather of Reagan Quill and the adoptive father of Mantis.

Relationships
He is the former lover of Meredith Quill. Through the brief relation, Ego had a son with her, and became the father of Peter Quill. After Quill learned he fathered a daughter, Ego was the paternal grandfather of Reagan Quill.