Mary Wilhelmine Sparenberg married Henry Herman Schröer 27 Mar 1860 in St. Charles County, MO. After his death, she married the widower, Friedrich W. Wulferkammer. Widowed again in 1880, Wilhelmine Wulferkammer/Wulfekammer married widower Ludwig Koch on 19 Mar 1885.
Obituary (Marthasville, February 1897): Died: --Sunday Feb. 14, Mrs. Louis Koch, of Holstein, Mrs. Koch had come here to the bedside of her sick daughter, Mrs. Schroer, where she suddenly took sick with that dreadful disease pneumonia and died. Her body was laid to rest in Holstein Tuesday afternoon. We extend sympathy to the family.
One interpretation of the above obituary: Mrs. Koch was attending her daughter-in-law, Emma (Krueger) Schroer, after the birth of Emma's daughter and Mrs. Koch's granddaughter, Mathilde Johanna Schroer (the future Mrs. Tillie Kelsick), who was born 3 January 1897 (Immanuel/s record, p. 155).