The New York Times has published an interesting article about returning stolen art to the the rightful owners. The part that interested me is that reporter Doreen Carvajal used an iPad, a telephone, and online genealogy databases to identify the heirs of the original owners. Carvajal wrote, "Like the French government, I was handicapped by the fact that many families do not even know what they have lost. With the tumult of war and the passage of time, families lose track of their possessions. Relatives die. Their histories, stories and documents all vanish."
Carvajal also credited Gilad Japhet, chief executive of MyHeritage.com, for a lot of assistance with the effort. It may be unusual for a CEO to take the time to help personally. The fact that he is fluent in French was also a big help.
You can read the full story by Doreen Carvajal at http://www.nytimes.com/2014/02/02/arts/design/a-reporter-in-france-helps-to-return-art-taken-by-the-nazis.html.