gundamexplored:

“In April of UC 0087, Astonaige befriended a young refugee boy who escaped from Green Noa 1 during the Gryps Conflict, Kamille Bidan.

Not wanting Kamille to ever again experience the tragedy of losing his family like he had during the Gryps Conflict, Astonaige took Kamille under his wing, acting as an older brother figure to him.

Furthermore, Kamille was given military training, and Astonaige tutored him in Mobile Suit maintenance.”

–Mobile Suit Gundam Characters Encyclopedia / Universal Century II