Without showing your HTML markup, I'm just guessing this is how it looks…
<form id="myform">
<input type="hidden" name="MaritalStatusDate" />
<input type="radio" name="radio" value="1" class="maritalStatusRadio" />
<input type="radio" name="radio" value="0" class="maritalStatusRadio" />
<input type="submit" />
</form>
In that case, this works...
depends: function(element) {
return !($("input[type='radio'].maritalStatusRadio[value='1']").is(":checked"));
}
DEMO: http://jsfiddle.net/nVc2N/
Side-note: It really should be ignore: []
if you want to ignore nothing.