I am the G3-grandson of Eliza Fegan (Fagen) and Richard Coulson. Eliza and Richard married in County Monaghan, Ireland in 1849, and immigrated to the US, to the Jersey City area, in about 1853.
Eliza's parents were William Fagen (Fegan) and Jane Smith. I do not know Eliza had any siblings. She was probably born around 1827-8.
If this rings bells for anyone, please feel free to contact me either here or via e-mail.