Katherine Kestler was born in 1891 as the daughter of Karl Keller (left Germany around 1880). She had 2 brothers (Peter and George) and two younger sisters (Elizabeth and Susanna (died in 1925). She lived in Chicago (Gidding? Street) and had three children at the age of fourty (so she wrote in a letter to my grand uncle in 1931). Thanks for any informations!