From Halopedia, the Halo wiki
In 2553, he and Gon were chasing their biggest brother Hiiq over a stolen toy catapult. They were told by their mother that they would have to share it. They ignored her and started fighting when Gon bite Hiiq's arm. Chol forced them apart and then scolded them. She then told them she was leaving and that there would be consequences if they gave their grandmother Ais any trouble.
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