Check out this link as it should be what your looking for:
jQuery validation: Indicate that at least one element in a group is required
Quoted from the above link:
To start with, I put class="required_group" on each of the elements in the group. Then, I added a custom validation method:
jQuery.validator.addMethod('required_group', function(val, el) {
var $module = $(el).parents('div.panel');
return $module.find('.required_group:filled').length;
});
... a custom class rule to take advantage of the new method:
jQuery.validator.addClassRules('required_group', {
'required_group' : true
});
... and finally a custom message for the new method:
jQuery.validator.messages.required_group = 'Please fill out at least one of these fields.';
Here is another link to someone that used this method but tweaked it:
jquery validation only one field in a group required