transportation from Geneva to Chamonix

My family of 4 (two kids ages 11 and 14) will be traveling to Europe next summer. We will fly into Geneva and plan to stay for 4 days before moving onto another city. While in Geneva, we are thinking of doing a day trip to Chamonix. Could anyone recommend the best way to get to Chamonix in the morning and come back at night: by train, by bus or rent a car?

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