I have uploaded the collection of information document that describes this land transaction:
"The most telling evidence that exists that confirms a marriage between Joseph Croshaw's daughter and Robert Blackwell is a land transaction
dated 19 November 1664 when Joseph Croshaw deeded as a gift 700 acres to his grandsons, Robert and James Blackwell, the acreage being
the northern part of a 1350 acre patent he received on 27 February 1649/50. The land was in what became New Kent County when York
County was divided in 1654 and was described as being on the south side of the York River "in the freshes" and ran to a branch "over against
Poropotank Creek to Whiteing's Branch to Arthur Price & stretching SW". The very fact that the land was being given to his grandsons tends
to indicate that both of their parents were deceased by the end of 1664. At this time both sons would have been in their late teens and would
have been several years short of being considered legally adults."