Proceed with caution. Robert's 1st wife (Theresa Gunther) and 2nd wife (Louisa Gunther) were most likely sisters, based on GOFA 1, marriage records and dates, census records and the birthdates of the children. The marriage record for Robert and Louisa exists, but neither a marriage record for Robert and Theresa nor a death certificate for Theresa has been located.
Year: 1880; Census Place: New York City, New York, New York; Roll: 894; Family History Film: 1254894; Page: 28D; Enumeration District: 563; Image: 0049. ----- Household Members: Name Age Robt. Olmstead 36 - Fireman Theresa Olmstead 18 - Housekeeping ----- [400 1/2 56th Street. Robert is a fireman.]