Thank you for the update. The information that you have provided so far is correct. I have located the census reports noted. In addition to this information I have found the following:

* A second marriage certificate for a Dennison Cook located in Greensville, VA for Dec. 28,1930

* Dennison's parents are noted as Nelson Cook , and Lucy Harrison.

* The last name Harrison seems to correspond with the 1880 census that notes Esther Harrison as a grandmother in the household of Dennison and Indiana Cook.
* I'm not totally sure if this certificate is accurate since Dennison's birth year is listed as 1864. On all of the other census reports it's listed as 1858. ( Census - 1880, 1900,& 1920)

I have also located a Sallie Cook that married Phil Robinson on June 15, 1879. They were found again in the 1880 Census.

* I was told that the family land stemmed from a Sallie Cook, but I'm not sure of the family connection yet.

Salle's parents and siblings have not been located.