The fact is these statements by the GW are incorrect:
1) the property owners son has no legal wright to grant me access to the property since it is on lease.
2) He said that the only people that can allow me out there are the actual property owner and the guy who leases the pastures for hay.
3) If I wanted to continue to use the property, since it is currently on lease, I had to get with my buddies dad and draw up paperwork allowing me on the lease.
1) Sounds like the GW is unfamiliar with the terms of a hay lease. I am also. With the leases I have signed in my life, the owner of the property and his family cannot allow people to enter the property, unless the lease specifically allows for it (eg maintenance, emergency etc).
2) Could be true. We don't know the type of relationship this property owner has with his son, and whether the son is allowed to "speak for" the owner. There are plenty of idiot sons out there.
3)Similar to 1).