import { createLayout, utils } from 'animejs';

const [ $button ] = utils.$('.controls button');

const layout = createLayout('.layout');

function animateLayout() {
  layout.update(({ root }) => {
    const $child = root.querySelector('.item');
    const $parent = $child.parentElement;
    const $nextParent = $parent.nextElementSibling || $parent.previousElementSibling;
    $parent.style.zIndex = '0';
    $nextParent.style.zIndex = '1';
    $nextParent.appendChild($child);
  })
}

$button.addEventListener('click', animateLayout);

<div class="large layout centered row">
  <div class="layout-container container-a col grid-layout row">
    <div class="item col">Item A</div>
  </div>
  <div class="layout-container container-b col grid-layout row">
  </div>
</div>
<div class="medium row">
  <fieldset class="controls">
    <button class="button">Swap parent</button>
  </fieldset>
</div>

#layout-usage-swap-parent-animation .container-b {
  flex: 2;
}