title: Firebase How to update multiple children?
body: <p>I have parent with many children like this:</p>
  
  <pre><code> Parent:{
          "childe1":"data",
          "childe2":"data",
          "childe3":"data",
          "childe4":"data",
          "childe5":"data"
   }
  </code></pre>
  
  <p>How can I update the children <code>[ childe1 , childe2 , childe3 ]</code> at same time, preventing any other user from updating them at same time?</p>