I am a little late in the game, but I haven't been back to the Kolar board in a while.
My husband's father was Robert J. Kolar, born in Chicago, IL(born about 1936). Robert has a brother, James who still lives in Chicago. Robert's father was Joseph F. Kolar (b:abt 1910 ? d:1970-80s Chicago IL). His wife's name was Lydia ?. I know that his line of Kolars are 'Czech'. I am still waiting on dates and sibling info from husband's family. Do you have a Joseph Francis Kolar b:abt 1905-15 in your family? Thanks, Jane email@example.com