Network of families in a contemporary population: regional and cultural assortativity Kunal Bhattacharya, Venla Berg, Asim Ghosh, Daniel Monsivais, János Kertész, Kimmo Kaski and Anna Rotkirch EPJ Data Sci., 7 1 (2018) 9 Published online: 18 April 2018 DOI: 10.1140/epjds/s13688-018-0137-9