It is well-known that family configurations have become more and more diverse over the last decades. Single-parent families, cohabiting families of the opposite or same sex, and intergenerational households are only examples of the current diversity. In Europe, family structures still vary substantially among countries. For instance, in 2011 the number of live births outside marriage ranged from 7.4% in Greece to 65% in Iceland. However, trends over time have substantially increased everywhere.