styling child html elements

[tralrypep]

I need to style some child elements in the dom but only if they are not a child of a specific element. as an example i need to bold the text in the span in this\[code\]<span class="a"> <span class="b"> <span class="c"> bold this test </span> </span></span>\[/code\]but not in this\[code\]<span class="a"> <a class="SomeOtherclass"> <span class="b"> <span class="c"> not bold </span> </span> </a></span>\[/code\]I dont have control of the output so i cannot change the class names or structure