Charles NICOLAI is listed in 1930 IN Elkhart Co. Benton Twp. with wife Ara and wife's brother Myron ROOKSTOOL. Also listed is dau. Erma I. BYLAND, granddau. Phyllis M. BYLAND. I have ROOKSTOOL (Susanna) & JUDAY (John) in my line from the Benton area but I am not familiar with Ara ROOKSTOOL.
This same family is listed in same area for 1900, 1910. Only thing is a Katherine/Catherine ROOKSTOOL widow is listed in household as Mother-in-law, not a Mary Ellen.In 1900 it shows Charles and Ara A. were married 8 years, that would put marriage about 1892.Hope this helps. Bev