University of Missouri Extension offers an enormous amount of information and resources on a variety of topics to the public. When it comes to families and parenting, this is no exception.
http://extension.missouri.edu/index.aspx (click on Families and Relationships Tab) is a solid and trusted website for families to find information related to child development, parenting and family care, and relationships, among other topics. The site is easy to navigate and includes publications on various topics that are reader friendly. Besides publications, on each topic, visitors can find links to quality websites, news, and even courses to take.
Also from this website, there is an index of scores of programs that may be beneficial to various families. St. Charles County (St. Peters) is the closest brick and mortar extension office listed and holds "in-person" parenting classes.