Over the years I have developed a functional Drupal 7 based genealogy site.
It was created using contributed modules and a slightly modified Bootstrap subtheme.
Entity Contruction Kit https://www.drupal.org/project/eck, Panels https://www.drupal.org/project/panels and Views https://www.drupal.org/project/views do most of the heavy lifting.
Take a look at it here https://sandesancestry.net
