Funeral Mass for Larry Lang, 74, of Jefferson, will be Monday at 11 am at St. Joseph Catholic Church in Jefferson.  A private family burial will be held in the Jefferson Cemetery at a later date.  Visitation with the family will be Sunday from 3 pm to 5 pm at the church.  A Knights of Columbus Rosary will be held at 4:45 pm.  Memorials are suggested to the Greene County Medical Center Foundation.  Slininger-Schroeder Funeral Home in Jefferson is assisting the family.  Online condolences may be left at sliningerschroeder.com.  Survivors include:  Wife, Joan.  Children, Megan Ward of Sandy Hook, Connecticut, Kevin Lang of Sunnyvale, California and Kristin Lang of Iowa City.  3 grandchildren.  Siblings, Marilyn Myli of Fort Myers, Florida, Jack Lang of Mason City, Marcia Siegel of Rochester, Minnesota, Richard Lang of Clive, Pat Lang of Ankeny and Mike Lang of Ankeny.