However, when a respondent choose either one should also be restricted from the relevant checkbox option in another or vice versa.

<script type="text/javascript" charset="utf-8">
// A function to handle "secondary" checkboxes
function secondaryCheckboxes(qID, primaryPosition, secondaryCount,primaryHide) {
  // Identify the elements
  var thisQuestion = $('#question'+qID);
  var primaryRow = $('li.question-item:eq('+(primaryPosition-1)+')', thisQuestion).closest('li.question-item');
  var primaryInput = $('input:checkbox', primaryRow);
  var secondaryRows = primaryRow.nextAll('li.question-item:lt('+(secondaryCount)+')');
  var secondaryInputs = $('input:checkbox', secondaryRows);
 
  var primaryHRow = $('li.question-item:eq('+(primaryHide-1)+')', thisQuestion).closest('li.question-item');
 
 
  // Indent the secondaries
  secondaryRows.css({ 'margin-left':'2.5em' });
 
  // Initial states of the secondary answers
  if (primaryInput.prop('checked') == false ) {
    secondaryRows.hide(); 
  } 
 
  // A listener on the primary answer to show or hide secondary answers 
  primaryInput.on('change', function (event) { 
 
    // Hide/show the secondary answers accordingly
    if (!$(this).is(':checked')) {
      primaryHRow.show(); 
      secondaryRows.hide();        
      secondaryInputs.prop('checked', false).trigger('change');
    }
    else {
      secondaryRows.show(); 
      primaryHRow.hide();        
    }
  });
} 
  $(document).ready(function() {
    // Sub-question 1 is primary followed by 3 secondaries
    // Sub-question 5 is to hide if 1 is checked
    secondaryCheckboxes({QID}, 1, 3, 5);
    // Sub-question 5 is primary followed by 3 secondaries    
    // Sub-question 1 is to hide if 5 is checked
    secondaryCheckboxes({QID}, 5, 3, 1);
    });  
</script>

Joffm wrote: Hi,
I think this fulfills your wish.

However, when a respondent choose either one should also be restricted from the relevant checkbox option in another or vice versa.

And if the primary checkbox is unchecked you see the initial "Yes/No" again.

I added a little bit to this - custom - workaround that you find here:
www.limesurvey.org/manual/Workarounds:_M...meSurvey_version_3.x

Code:

<script type="text/javascript" charset="utf-8">
// A function to handle "secondary" checkboxes
function secondaryCheckboxes(qID, primaryPosition, secondaryCount,primaryHide) {
  // Identify the elements
  var thisQuestion = $('#question'+qID);
  var primaryRow = $('li.question-item:eq('+(primaryPosition-1)+')', thisQuestion).closest('li.question-item');
  var primaryInput = $('input:checkbox', primaryRow);
  var secondaryRows = primaryRow.nextAll('li.question-item:lt('+(secondaryCount)+')');
  var secondaryInputs = $('input:checkbox', secondaryRows);
 
  var primaryHRow = $('li.question-item:eq('+(primaryHide-1)+')', thisQuestion).closest('li.question-item');
 
 
  // Indent the secondaries
  secondaryRows.css({ 'margin-left':'2.5em' });
 
  // Initial states of the secondary answers
  if (primaryInput.prop('checked') == false ) {
    secondaryRows.hide(); 
  } 
 
  // A listener on the primary answer to show or hide secondary answers 
  primaryInput.on('change', function (event) { 
 
    // Hide/show the secondary answers accordingly
    if (!$(this).is(':checked')) {
      primaryHRow.show(); 
      secondaryRows.hide();        
      secondaryInputs.prop('checked', false).trigger('change');
    }
    else {
      secondaryRows.show(); 
      primaryHRow.hide();        
    }
  });
} 
  $(document).ready(function() {
    // Sub-question 1 is primary followed by 3 secondaries
    // Sub-question 5 is to hide if 1 is checked
    secondaryCheckboxes({QID}, 1, 3, 5);
    // Sub-question 5 is primary followed by 3 secondaries    
    // Sub-question 1 is to hide if 5 is checked
    secondaryCheckboxes({QID}, 5, 3, 1);
    });  
</script>

Joffm