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On the 1915 census..mary is a child after fanny...then comes michael. There is no mary on 1920. She shows as 2 years younger than Fanny. In 1915 there is a daughter Rose, who is before the last born, patrick. She isnt in 1920.
Yes...Mary was married in Feb of 1920...the census date was April for her family...Her husband (Nicolas Fredericks - many spellings) does show up as single because his family's census date was January ....So, there is no record of Mary in 1920 because of this.