$(document).on('click', 'input[type="checkbox"][data-group]', function(event) {
  // The checkbox that was clicked
  var actor = $(this);
  // The status of that checkbox
  var checked = actor.prop('checked');
  // The group that checkbox is in
  var group = actor.data('group');
  // All checkboxes of that group
  var checkboxes = $('input[type="checkbox"][data-group="' + group + '"]');
  // All checkboxes excluding the one that was clicked
  var otherCheckboxes = checkboxes.not(actor);
  // Check those checkboxes
  otherCheckboxes.prop('checked', checked);
});