Alice, The IPCH in Chgo was not operating in the early 1900's, so your father & uncle weren't there. Most orphanages were run by religious organizations in the late 1800's & early 1900's. I think you must have more info in order to find the right institution to begin your search. Was your father raised a Catholic or Lutheran or .... ? North side, South Side? Also, WWI was over by 1920.