I am new to PowerShell. I have to write a script which can return me the first parent(node) value by passing the child node.

I have the following XML. When I pass my PowerShell script the value "AAA", it should return "parent2", and when I pass "III", it should return "parent311".

Can someone help me write this script?

XML:

<root>
  <parent>
    <parent2>
      <child>AAA</child>
    </parent2>
    <parent3>
      <child>BBB</child>
      <child>CCC</child>
      <child>DDD</child>
    </parent3>
    <parent4>
      <child>EEE</child>
    </parent4>
    <parent5>
      <child>FFF</child>
    </parent5>
  </parent>
  <parent21>
    <parent211>
      <child>GGG</child>
    </parent211>
    <parent311>
      <child>HHH</child>
      <child>III</child>
      <child>JJJ</child>
    </parent311>
    <parent411>
      <child>KKK</child>
    </parent411>
    <parent511>
      <child>LLL</child>
    </parent511>
  </parent21>
</root>