Answer:
1. Nelson, farmhouse located on the east side of the Willis Church Road
Nelson's farm was formerly owned by Frayser for whom the battle is often named.
2. Whitlock, farm located west of the Willis Church Road
"
The 10th and 12th Pennsylvania regiments ... had made a strongpoint out of the log farmhouse of a man named Whitlock, piling up fence rails in the yard as a rough breastwork. The Virginians stormed right over the position, driving the Pennsylvanians before them. ..."
-- Stephen W. Sears: To the Gates of Richmond Page 295
CWT Map:
http://www.civilwar.org/battlefields/glendale/maps/glendalemap.html
I see there are different answers, Hoosier may choose to give partial credit if he wishes.
Edit - Sources have been submitted to verify that fighting also took place on two small farms owned by two brothers named Sykes. Therefore, I will accept answers including any two of Nelson, Whitlock, and Sykes.
Many players (including me) answered Nelson and Frayser (or Frazier), but Nelson's farm was previously owned by Frayser, so Nelson's farm and Frayser's farm were one and the same. They were not two separate farms, so I can't give full credit for that answer.
However, upon further consideration, I have decided to take Ami's suggestion and give partial credit for that answer. There are a lot of sources that specify that the Battle of Frayser's Farm is an alternate name for the Battle of Glendale, and many of those sources do not mention any other farms at all. Under the circumstances, it is understandable that many players were inclined to think that the question was flawed and that there was only one farm where fighting took place, but if they wanted to get credit for a correct answer, they'd better come up with two names for that farm. So I'm going to give 5 points credit to all the players who correctly identified Nelson and Frayser as people who owned that farm at different times.
Hoosier