His real parents gave him up for adoption because he had serious, uncontrollable anger management problems. The Strong family adopted him because he threatened to pound them into the dirt if they didn't. Strong Mad idolized his little brother Strong Bad because he was always getting into mischeif. For this reason, Strong Mad obeys Strong Bad's every word. Or maybe that's just because he's so stupid. Strong Mad's anger can only be doused by cute cuddly little things. Hence, he loves The Cheat.