Mary Mulford Brandt Stewart; Somerset, NJ

I am seeking information on my GGGG Grandmother Mary Mulford Brandt who died before 1 AUG 1868.She was a member of the Dutch Reformed Church and married to Abel Stewart, a Scottish mechanic.They had eight children:David (1806-1865), Mary, Ann, William, Johnathan, Samuel, Abel T. (1822-1878), and Martha.

I do not know her parents or a connection to the Mulford line.I appreciate any help.