Sharing a little query example that I just created when looking for interesting cases in the data. In case you are asked "what's your relationship with your spouse" here is a list of most common answers: http://tinyurl.com/ycm8fllo Possibly useful and/or entertaining for other properties as well. Finding all cases where a particular double relationship holds should be an easy exercise. Cheers, Markus -- Prof. Dr. Markus Kroetzsch Knowledge-Based Systems Group Center for Advancing Electronics Dresden (cfaed) Faculty of Computer Science TU Dresden +49 351 463 38486 https://kbs.inf.tu-dresden.de/