This study examines the relative distribution of step-families across four Canadian regions (Atlantic Provinces, Québec, Ontario and the West), using data from two retrospective surveys on the family conducted in 1984 and 1990. The first part of the analysis measures the propensity of women to live in step-families in the four regions at the time of the two surveys. Based upon the 1990 survey, the second part examines the extent to which the methods of forming a step-family differ from one region to another, and the manner in which the propensities of women to experience this situation for the first time has changed over generations; it also provides information on the length and the result of these family episodes. More generally, the longitudinal analysis of family recomposition enables one to identify the major trends in family composition across the four regions studied, and to sketch the expected evolution of step-families in these regions.