Robert 'Sarge' Walker is the former father-in-law of Luke Wheeler and the grandfather of Colt Wheeler and Sage Wheeler.


He is first seen in the Season Four episode We've Got Nothing But Love to Prove when Luke visits him after Colt plans to enroll in the US Army. There is tension between him and Luke due to his daughter marrying him.

After Colt is injured and lands in hospital, Sarge again lays into Will for being a bad role model but later comes around when Colt admits that he got into a fight with fellow cadets who badmouthed Luke over his association with Will Lexington and that he was sticking up for him.

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