Yes, there was a daughter Nancy whose birth was recorded in the records of Prince George's Parish, Montgomery Co., MD. I don't believe there is a record of the marriage of Zadock and Eleanor. The marriage records of Montgomery County only go back to 1798, earlier marriages are missing. Zadock Robey is listed in the 1790 Census in Montgomery County, living alone, over 16 years of age. Richard Selby is listed two lines lower on the page, 2 males over 16 years of age, 4 males under 16 and 5 females. This would, presumably, be Richard and Martha and their 9 children.