The family institution has undergone important transformations in recent decades that have led to a greater prevalence of common-law unions and an increase of repartnering, that is, of second marriages and common-law unions. A new study released today, based on data from the 2017 General Social Survey – Family, examines first union dissolution in Canada. The goal of the analysis is to understand the sociodemographic factors that influence the duration and the risk of first union dissolution. This analysis sheds light on the differences between landed immigrants and Canadian-born individuals with respect to union instability.