I am interested in using Wikidata to encode genealogical relationships. Of course, it already has properties that do this, and there's an associated project. My effort focuses on use of the WeRelate genealogy wiki to more conveniently designate the genealogical relationship graph. From there, by use of software that compares the contents of WeRelate and Wikidata, the needed Wikidata properties can be automatically determined.
Please see this page on WeRelate for more specific information.