Mutually excluding checkboxes in Word table

I created a Word Document (Word 2016) that, by clicking a button, generates a Table with predefined text and formatting.

Column1	Column2	Column3
QUESTION (Y/N)	YES_Checkbox	No_Checkbox

Row number 8 (shown above) contains a YES/NO question; to manage that, I inserted two Checkboxes (one in Column2, the other in Column3) using the following syntax:

For ii = 2 To 3
    Set rng = mytable.Cell(8, ii).Range
        rng.Select
    With Selection
        .Collapse Direction:=wdCollapseStart
        .Range.ContentControls.Add wdContentControlCheckBox
        .MoveRight Unit:=wdCharacter, Count:=2
    End With
Next ii

My idea is to have mutually exclusive checkboxes: that means, if User selects "YES" the "NO" is automatically deselected (and vice-versa). To do so, I created a Sub within the main button script. It checks for the checkbox value and then tries to 'tick it' (on un-tick it) using the following code (not yet completed):

Sub Check_YES_Not(tblNew)
Dim thisCell As Range
check1 = mytable.Cell(8, 2).Range.ContentControls(1).Checked
check2 = mytable.Cell(8, 3).Range.ContentControls(1).Checked
    'If condition to be added
    check1 = True 'This is how I am trying to modify the checkbox, but it is not working
    'ElseIf add other conditions...
    'Msgbox "to be completed..."
    'End If
End Sub

Code runs and creates the table correctly, but the checkbox scripts is not behaving as I wish. Could someone please tell me what I am doing wrong and how I could make it work? Thank you very much.