My wife will be hunting too. this is on her father property, is it true that she does not need a hunting licence in Ohio?
From the Ohio hunting regulations booklet which you can also download online in its entirety:
"Landowners, spouses and their children - Are not required to have a hunting license, fur taker permit, deer permit, antlerless deer permit, spring or fall turkey permit or Ohio Wetland Habitat Stamp when they are hunting or trapping on land they own."
There is no mention of whether they have to be residents for this privilege. Also, it's possible that you being a son-in-law of the landowner might give you that privilege but I would call the Ohio DNR to be sure on that one.
Regarding tags to hunt on your own property; you can make them yourself. They have to include your name, address and date and time of the kill.