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If you or your kid wants more playing time, tell him to be the best one on the team. Score the most goals. Make the most plays. Make passes and be the best skater. Once that happens I'm sure your son will get more playing time than the coaches' kid. Until then, your kid is the same as everyone else on the team and the coach will go with who he's most comfortable with which is likely his kid.
Sorry your kid is terrible and you have to make excuses for him. He probably likes the coach’s kid and likes playing with him but your the problem.