Jquery select elements, select fixed child elements under the same class, only the index values of father and child, how to choose to child

<div class="father">
     <div class="child">child1</div>
     <div class="child">child2</div>
     <div class="child">child3</div>
     <div class="child">child4</div>
 </div>
  <div class="father">
     <div class="child">child1</div>
     <div class="child">child2</div>
     <div class="child">child3</div>
     <div class="child">child4</div>
 </div>
  <div class="father">
     <div class="child">child1</div>
     <div class="child">child2</div>
     <div class="child">child3</div>
     <div class="child">child4</div>
 </div>
Html
Mar.31,2021
Is that what

means? 

  
 nth-of-type

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eac06c-47e5a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eac06c-47e5a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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