Hi...Yes, your Alma Emerson is sister to my Mariam Miranda Emerson....their parents are Moses Emerson and Marcia Leete. Alma had a sister who married another Howieson.
Do you happen to have a picture of Alma & her husband? I have one of Mariam and one of another sister (have to look up the name...either Susan or Sarah I think) that married the other Howieson (have a pix of him too). Mariam also went under Mary and she married James Goodhue. On one of the census records (forget which one) she is listed with your Alma as she must have been visiting her when the census taker came around.
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if you wish.