how to remove elements

how to remove elements

I need to remove certain elements from a given  element up to, but not including, the parent close tag.

  1. <div id="parent">
  2.       <div id="child1"></div>
  3.       <div id="child2"></div>
  4.       <div id="child3"></div>//delete from here all the way down until the parent end tag 
  5.       <div id="child4"></div>
  6. </div>
Please comment