Selecting nodes in between comments with xpath from xmldocument

I'm trying to get nodes in between comments.

example:

<Name>
  <First>a</First>
  <Last>b</Last>
</Name>
<!-- family names -->
<Name>
  <First>c</First>
  <Last>d</Last>
</Name>
<Name>
  <First>e</First>
  <Last>f</Last>
</Name>
<Name>
  <First>g</First>
  <Last>h</Last>
</Name>
<!-- family ends -->
<!-- other names -->
<Name>
  <First>i</First>
  <Last>j</Last>
</Name>
<Name>
  <First>k</First>
  <Last>l</Last>
</Name>
<!-- other ends -->

I'd like to be able to select the nodes in between the comment family names and family ends. Tried several ways with xpath, but I cant get further then selecting all comment nodes. When I want to select comment nodes containing value x, I do not get any result. So I'm not sure how to continue. for example:

var x = xml.SelectSingleNode("//comment()[contains('family names')]");

Thanks in advance.