Final answer:
The changing of families over time has been analogized using the family life cycle and the family life course models, with the latter offering a more fluid perspective on family transitions.
Step-by-step explanation:
The analogy given by a Canadian sociologist to describe the changing of families over time is the concept of the family life cycle and the more recent family life course. The former was introduced by Murphy and Staples in 1979, who suggested that families go through various stages, each with its distinct challenges and needs. However, the family life cycle approach has been succeeded by the family life course model, proposed by Strong and DeVault in 1992, which offers a more fluid understanding of family transitions, acknowledging the changes in family development and diversity, such as childbearing outside of marriage and the varied forms that families can take in modern society.