Thanks Ken, but I need to clarify the Pro feature:
1. Any user can do a path search, anchored on themselves or someone else (using the green push-pin, as described in this help page: http://help.geni.com/entries/458560-how-to-find-other-people-s-rela...), and can see the description of the relationship, if found. This means Sherry can use the push-pin on her mother, and do a path search to whomever to get back "23rd cousin" or whatever.
2. Only paying users (Pro or Plus) can see the full path with all the people in-between.
Hope that helps!