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R. bras. Est. Pop., Rio de Janeiro, v. 29, n. 1, p. 213-216, jan./jun. 2012 * PhD Candidate in Sociology and Demography at University of California, Berkeley and Capes/FULBRIGHT Fellow. 1 One possible explanation for this is that stepparents do not have the same motivation to invest in their stepchildren as they have to invest in their own biological children (BIBLATZ; RAFTERY, 1999). Another explanation is the fact that stepfamilies are more likely to move and suffer from disruptions in access to community resources (MCLANAHAN; SANDEFUR, 1997). Single-parenting: a case of class division on ideas of marriage and motherhood