JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.10.0/jquery.validate.min.js"></script>
<label><input type="radio" name="address" id="dadaddress" /> Dad address</label>
<label><input type="radio" name="address" id="momaddress" /> Mom address</label>
<label><input type="radio" name="address" id="bothparents" /> Both addresses</label>

<form method="post" action="/">
    <fieldset id="dad_address">
        <legend>Dad's Address</legend>
        <label>Address line 1: <input type="text" name="dad_address_1" class="required" /></label>
        <label>Address line 2: <input type="text" name="dad_address_2" /></label>
        <label>State: <input type="text" name="dad_town" class="required" /></label>
        <label>Zip: <input type="text" name="dad_zip" class="required" /></label>
    </fieldset>

    <fieldset id="mom_address">
        <legend>Mom's Address</legend>
        <label>Address line 1: <input type="text" name="mom_address_1" class="required" /></label>
        <label>Address line 2: <input type="text" name="mom_address_2" /></label>
        <label>State: <input type="text" name="mom_town" class="required" /></label>
        <label>Zip: <input type="text" name="mom_zip" class="required" /></label>
    </fieldset>
    <button type="submit">Go</button>
</form>

CSS

fieldset {
    margin: 20px 0;
    padding: 5px;
}

label {
    display: block; 
}

.error {
    color: #c00;
}

JavaScript

// toggleFields (mini) plugin to toggle element
// visiblity and disable/enable the fields within it
$.fn.toggleFields = function(condition) {
    return this.each(function(i, el) {
        el = $(el);
        el.toggle(condition).find(':input').attr('disabled', el.is(':hidden'));
    });
};

$(document).ready(function(){
    var dadAddr = $('#dad_address'),
        momAddr = $('#mom_address'),
        dadTrigger = $('#dadaddress'),
        momTrigger = $('#momaddress'),
        bothTrigger = $('#bothparents');

    // hide and disable fields
    dadAddr.toggleFields(false);
    momAddr.toggleFields(false);

    bothTrigger.click(function() {
        dadAddr.toggleFields(this.checked);
        momAddr.toggleFields(this.checked);
    });

    dadTrigger.click(function() {
        dadAddr.toggleFields(this.checked);
        momAddr.toggleFields(false);
    });

    momTrigger.click(function() {
        momAddr.toggleFields(this.checked);
        dadAddr.toggleFields(false);
    });
    
    $('form').validate();
});