My records show a Rachel Gassaway born December 15, 1750.  Her parents were Margaret Pierpont & Nicholas Gassaway, Jr.
She had a brother Nicholas Gassaway, that married Cassandra Randell.  They had a daughter Rachel.
The only date I have for them is the death date for Nicholas Gassaway.  he died in 1815.
Hope this information will help you
Donna Holt
memoryroom<at>adelphia.net