Henry Koleber (b. 1845 or 1866?) in Kratzke, Saratov, Russia

I inherited this photo from my Grandmother Mollie (Koleber) Margheim. She wrote on the back that it is "Grandpa Koleber's older brother and grandchildren....they never came to America" (from Kratzke, Saratov, Russia). If she meant her kids' grandpa, this would be Heinrich Koleber b. 1866 in Kratzke, spouse unknown to me. If she meant HER grandpa's older brother it would be Georg Heinrich Koleber (b. 1845) and wife Sophia Schmidt, in Kratzke. wish I knew for sure and knew who the grandkids were.