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In page Sociology of the family:

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In Canada, one-parent families have become popular since 1961 when only 8.4 percent of children were being raised by a single parent.[1] In 2001, 15.6 percent of children were being raised by a single parent.[1] The number of single-parent families continue to rise, while it is four times more likely that the mother is the parent raising the child.[citation needed] The high percentage of mothers becoming the sole parent is sometimes due to the result of a divorce, unplanned pregnancy or the inability to find a befitting partner.[citation needed].