1. Paste the code below into a html element.
2. Add a checkbox to your form named checkbox1
3. Give your checkbox1 three options
Yes, No and Maybe

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function() {

var jQ = $.noConflict(true);
jQ("input[name='checkbox1[]']").click(function() {

if(jQ(this).prop('checked')== true && jQ(this).val()== "Yes"){

jQ("input[type=checkbox][value=No]").prop("checked",false);
jQ("input[type=checkbox][value=Maybe]").prop("checked",false);

}
else if(jQ(this).prop('checked')== true && jQ(this).val()== "No" ){

jQ("input[type=checkbox][value=Yes]").prop("checked",false);
jQ("input[type=checkbox][value=Maybe]").prop("checked",false);
}
else if(jQ(this).prop('checked')== true && jQ(this).val()== "Maybe" ){

jQ("input[type=checkbox][value=Yes]").prop("checked",false);
jQ("input[type=checkbox][value=No]").prop("checked",false);
}
});

});
</script>