There are few papers in the economics literature that examine the relationship between schooling and parent inputs. In a developing country context, Pop-Eleches and Urquiola (2012) and Das et al. (2011) find evidence consistent with substitutability between parent and schooling inputs. Our analysis builds on studies that have empirically examined aspects of HS and its impact on children. HHS (2010) investigates data from the HSIS, focusing primarily on the impact of HS on children's cognitive and non-cognitive test scores. As we describe later, HHS (2010) also investigates certain measures of parent involvement with their children but finds very limited evidence that parent involvement was impacted. The HSIS collected a rich set of data that are not analyzed in HHS (2010) but that we analyze in this study; these data show a strong impact of HS on a wide variety of parent involvement outcomes. Relative to HHS (2010), we investigate the impact of HS on an order of magnitude more parent outcomes; using data on more outcomes reveals that many outcomes HHS (2010) does not explore are significantly affected by HS enrollment. We explore the mechanisms through which the effect on parent involvement may operate, including by documenting the positive cross-program correlation between effects on cognitive scores and effects on parent involvement. Finally, we place our results in a possible theoretical context. (author abstract)