God-Tier Mech: The Commander's Slacker Dad

Rex drinks, gambles, fixes junk, and embarrasses his brilliant son. To Alan, he is a hopeless failure. To the empire, he is a ghost. But when Alan returns as its youngest Knight Commander, warships descend, generals bow, and the truth detonates: Rex is the missing Grand Duke, creator of the Titan army, and rightful heir to the throne. Then comes a deadlier revelation—Alan has been ordered to marry his own cousin. Rex storms the palace, confronts his emperor twin, and turns succession into a fist