I've learned to examine all possibilities when doing genealogy, and I would also consider that perhaps James Doherty was kin to Susan and Dennis.
I found this-
1910 census, San Francisco Assembly District 33, San Francisco, California Dennie Hircel 47 Rose Hirrel 37 Carmel Hirrel 14 Charles Hirrel 13 Philip Hirrel 11 Edward Hirrel 8 Rose Hirrel 6 Allen McLaughlin 6 Dennis Ruddy 63 uncle imm 1875 Marcel Mitchell 1/12 [1m]
1900 census, San Francisco, San Francisco, California
Dennis Hirrel 36 Rose Hirrel 28 Carmenn Hirrel 4 Charley Hirrel 3 Philip Hirrel 2 Maggie Collins 22 Dennis Ruddy 59
So I'm wondering if there is a Rose that married Hirrel and Sarah that married James Doherty.
SF Call, 7/1/1903 HIRREL- In this city, 6/30/1903, Francis J., beloved twin son of Dennis and Rose Hirrel, a native of SF, 3m 4d.
11/29/1899 HIRREL- In this city, 12/27/1899, Sarah Hirrel, beloved mother of Charles, Maggie, Mary, Daniel, Dennis, and Patrick Hirrel and Mrs. Rose Harkins, a native of Carndonagh, County Donegal, Ireland, aged 64 years...St. Joseph's, interment Holy Cross.
4/19/1901 Pat Hirrel, a fireman on the steamer Queen, was badly burned yesterday. He opened a tin of gasoline, thinking it was kerosene, and the gasoline exploded.