Not sure if this obituary relates to the same Max Mueller or different Max Mueller- showing wife of Amelia in 1891. In addition- the Divorce announcement I will post after this shows Max and Katy only had one child at time of divorce. Brighton is a section of Sacramento, now known as East Sacramento.
Mueller - Near Brighton, July 2, Fritz, only son of Max and Amelia Mueller, aged 3 months and 16 days.
Sacramento Union, July 3, 1891