JSFiddle - React, Tailwind, and code Playground

HTML

<select id="mark">
  <option value="">--</option>
  <option value="bmw">BMW</option>
  <option value="audi">Audi</option>
</select>
<select id="series">
  <option value="">--</option>
  <option value="series-3" class="bmw">3 series</option>
  <option value="series-5" class="bmw">5 series</option>
  <option value="series-6" class="bmw">6 series</option>
  <option value="a3" class="audi">A3</option>
  <option value="a4" class="audi">A4</option>
  <option value="a5" class="audi">A5</option>
</select>

JavaScript

(function($) {
 
    $.fn.chained = function(parent_selector, options) {
       
        return this.each(function() {
           
            /* Save this to self because this changes when scope changes. */            
            var self   = this;
            var backup = $(self).clone();
                       
            /* Handles maximum two parents now. */
            $(parent_selector).each(function() {
                                               
                $(this).bind("change", function() {
                    $(self).html(backup.html());
 
                    /* If multiple parents build classname like foo\bar. */
                    var selected = "";
                    $(parent_selector).each(function() {
                        selected += "\\" + $(":selected", this).val();
                    });
                    selected = selected.substr(1);
 
                    /* Also check for first parent without subclassing. */
                    /* TODO: This should be dynamic and check for each parent */
                    /*       without subclassing. */
                    var first = $(parent_selector).first();
                    var selected_first = $(":selected", first).val();
               
                    $("option", self).each(function() {
                        /* Remove unneeded items but save the default value. */
                        if (!$(this).hasClass(selected) &&
                            !$(this).hasClass(selected_first) && $(this).val() !== "") {
                                $(this).remove();
                        }                        
                    });
               
                    /* If we have only the default value disable select. */
                    if (1 == $("option", self).size() && $(self).val() === "") {
                        $(self).attr("disabled", "disabled");
                    } else {
                        $(self).removeAttr("disabled");
                    }
    ...