It’s been years since Bill and Tammi Secor and their three now-grown children have work­ed side-by-side on their family farm north of Fort Dodge.
 
But today here they all are, walking through the farm’s vineyard, inspecting the vines and snacking on a few grapes as they work.

Son Robert Secor, 27, started the family vineyard in 2007 while studying horticulture at Iowa State University (ISU). This summer,...