Thank you for replying to my message. The Parke sisters were daughters of Peter W. Parke (1813-1845), son of David Parke (1782-1863), son of William Parke (d. 1803) of Hunterdon County, NJ. I have not done any research on William's ancestry, but he may be descended from Roger Parke (1682).
I have managed to locate and contact some descendants of the two Parke sisters, but would like to hear from more.