JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.js"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/additional-methods.js"></script>
<form id="myform">
    <select name="quantity[adult][seat_a]" class="group-required">
        <option value="">0</option>
        <option value="1">1</option>
        <option value="2">2</option>
    </select>
    <br/>
    <select name="quantity[adult][seat_b]" class="group-required">
        <option value="">0</option>
        <option value="1">1</option>
        <option value="2">2</option>
    </select>
    <br/>
    <select name="quantity[adult][seat_c]" class="group-required">
        <option value="">0</option>
        <option value="1">1</option>
        <option value="2">2</option>
    </select>
    <br/>
    <input type="submit" />
</form>

JavaScript

$(document).ready(function () {

    $('#myform').validate({
        // other options,
    });

    $('.group-required').each(function () {
        $(this).rules('add', {
            require_from_group: [1, '.group-required']
        });
    });

});