Culture has been recognized to play an important role in the formation of parental beliefs, but the question still remains of whether beliefs are maintained or revised over time, and how. The present study examined how proximal influences impacted parental beliefs in an immigrant sample of parents, the thesis being that distal influences have more to do with the formation of parental beliefs while proximal influences have more to do with maintaining or revising them. Effects of the proximal influences of education, occupation status, information networks, and parental agreement about childrearing, on parental beliefs of Mexican-origin fathers and mothers around cultural values of familism/respeto, simpatía, and individualism were tested longitudinally. The research questions were two-fold in nature, looking at within-time effects of the proximal influences on parental beliefs; as well as over-time effects of proximal influences on change in parental beliefs. The within-time questions were answered using hierarchical regression analyses while the over-time questions were answered using repeated measures MANCOVAs. Overall, the beliefs of parents in this study were seen to not change significantly over the course of the three years that they were assessed, and so the study did not yield the results expected in terms of the effects of proximal influences on parental beliefs. However, information networks and fathers' occupation status did emerge as promising proximal influences on parental beliefs, and the results also revealed maternal beliefs to be more responsive to the proximal influences of education, fathers' occupation status, information networks, and parental agreement about childrearing, than paternal beliefs.