Thanks. I saw those articles a few weeks ago and I wonder if maybe Kate was his second wife.
My dad remembers his grandfather Julius going to visit his sister shortly before she died. Maybe she was only a half sister.
I also recently found an obituary for Bertha, max's sister. It has max's daughters married name Anna Melin. Bertha's first husband passes away and she gets married again with a new last name.
There is also a Lizzie Mueller who shows up on a few documents and I'm not sure how she fits in to the tree.
Next time I'm in sacramento with time to kill I am hoping to go look at the county recorders office. I did a search of the index and there are a few documents for this family. I don't know what kind of info would be on them but maybe there will be something.
I found an obituary in San Francisco that listed children named max and Bertha. Sadly when I did the math he would have been 12 years old when he had max so I am doubtful.