Mobile Suit Gundam AGE

Advanced Generation (A.G.) 101. The space colony Angel is attacked and destroyed by a mysterious "Unknown Enemy" with overwhelming strength. As this "UE" continues its attacks, a boy named Flit Asuno loses his mother when she is caught in the crossfire. Now in A.G. 115, Flit must fight using a new Gundam of his own creation, which evolves itself through battle. The curtain rises on an epic Gundam saga spanning 100 years and three generations.

Tags: anime, grandfather grandson relationship, gundam