After a recent upgrade to this site, the Frank Harris genealogy page disappeared. There was no mystery involved: the genealogy was displayed using a custom Drupal module which I wrote some while ago and hadn't migrated to the latest release of Drupal.
I've now updated the code and it's working again. (Should anyone be interested in how it works, it queries a set of tables derived from GENMOD data. It's not in a suitable state for re-use but could be made so with a little extra effort.)