I don’t see James’s entry into the US and, in the 1920 census, he claimed to be born in California, father b. England, mother b, Ireland. Also, there’s no sign of the step children in 1920. I havn't found Myrtle in 1920, either.
The problem with finding Christine is that she entered the US in 1911 and so she isn't on the 1910 census. Her kids might even have been born in Canada.
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California Voter Registration, 1900-1968, San Francisco
1924 – Beament, Mrs. Christena, 812 Alvarado, housewife, republican
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1910 Census [if this is the right Myrtle, she seems to have been enumerated twice and she was a twin]
4712 25th St., San Francisco Assembly District 34, San Francisco, California
Bartram, Henry A., 45, married twice, current marriage 5 yrs., b. Denmark, parents b. Denmark, naturalized, immigration date illegible, laborer, sugar co.
Stella M., wife, 35, married twice, current marriage 5 yrs., 5 children 3 living, b. South Dakota, father b. Scotland, mother b. Iowa, no occupation
Lillie, Louis L., step-son, 4, California
Lillie, Agnes M., step-daughter, 9 California
Bartram, Henry G., son, 3, California
Lang, Myrtle, boarder, 2, California
Lang, Alice, boarder, 2, California
St. Vincent DePaul Catholic Human Bureau, San Francisco Assembly District 37, San Francisco, California
Lang, Alice, inmate, 2, California, parents birthplace unknown
Lang, Myrtle, inmate, 2, California, parents birthplace unknown
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Possible birth of Myrtle:
Myrtle Lang, 8 April 1908, mother’s maiden name McDonald, Alameda County
Alice Lang, 8 April 1908, mother’s maiden name McDonald, Alameda County
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