jQuery to update checkbox value, depending on radio field?

Goal is to update checkbox fields to equal TRUE or FALSE, depending which radio button option is picked. If I select FALSE, then the checkboxes must be unchecked.

I'm only able to get the checkboxes ticked if I select TRUE. Is it because I defined that as a value?

     $(function() {
var MAIN= $("input[type='radio'][value='TRUE']");
var marketing1 = $("input[type='checkbox'][value='']");
var marketing2 = $("input[type='checkbox'][value='']");

    MAIN.on('change', function()
        {
      if ($(this).val() == "TRUE")  {
             marketing1.prop('checked',this.checked);
             marketing2.prop('checked',this.checked);
        } if ($(this).val() == "FALSE") {
             marketing1.prop('checked',this.checked, false);
             marketing2.prop('checked',this.checked, false);
        }

    });
});

From HTML

     <input type="radio" name="MAIN" value="TRUE"/> Yes
     <input type="radio" name="MAIN" value="FALSE"/> No

First -  <input type="checkbox" name="marketing1" value=""/>
Second -  <input type="checkbox" name="marketing2" value=""/>