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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