This article compares time invested in children across family structures as a means to understand differences in children’s development. Using data from the 1997 Panel Study of Income Dynamics’ Child Development Supplement, we measure time investments from multiple caregivers and distinguish time children spend with a caregiver alone versus shared with another caregiver. We examine six family structures—married biological parents, cohabiting biological parents, mother and stepfather, mother and cohabiting boyfriend, single mother only, and multigenerational households. The total care-giving time that children receive in married biological parent families and cohabiting biological parent families is comparable to that for children living in stepfather families and multigenerational families. This is because children in stepfather families and multigenerational households receive substantial time investments from nonresident biological fathers and grandparents, respectively. In contrast, children receive little time investment from resident nonbiological father figures; and children in single mother, cohabiting boyfriend, and multigenerational households receive little time investment from their nonresident biological fathers. Finally, children who live with married biological parents receive the greatest share of caregiving time in the form of shared caregiving compared with children in all other family structures. Our findings suggest that having two resident biological caregivers predicts greater time investments in children and that shared parenting may be an important dimension of family structure.