She is married to Margaret Strang.
They got married on January 31, 1845.
Source: FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints
accessed 22 Jun 2016), entry for Fredrick G. Brewster, person ID MD7Q-MFY.
_FSLINK: https://familysearch.org/tree/#view=ancestor&person=MD7Q-MFY
The data shown has no sources.