Identity:
Maria Margaretta Cammann was the daughter of Philip Jacob Oswold of Swabia, Germany. She married Charles Louis Cammann of Loxdedt, Hanover, and was left a widow at the age of thirty years.
Life:
She brought up at least eight children on her own. She was known in the Whistler family as 'Grandma C.'
Bibliography:
Brooklyn City Directory, New York, 1861, p. 59.