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You can stream Tetsujin 28: Morning Moon of Midday (2007) on Amazon Prime with a subscription.

Japan, ten years after World War II. Boy detective Shotaro solves mysteries and fights crime with the help of Tetsujin 28, the 50-foot tall giant robot left for him by his late genius father. But one day he's shocked to learn that his father also adopted and raised another boy named Shotaro, now a repatriated soldier. Just as surprising to our young hero is the fact that his “big brother” can also control Tetsujin, even better than he can. But with the emergence of this elder brother comes danger, as a mysterious assassin, Morning Moon, closes in on the boy for being unworthy of controlling the robot. Meanwhile, the capital faces destruction when multiple bombs are discovered, planted by the two Shotaros' father himself!

A boy's bond with his massive robotic guardian fractures when a long-lost brother emerges from the shadows of the post-war era. This mechanical clash pits childhood wonder against the harsh reality of a fractured family legacy.