land dower

I found some property I want to buy well found out that the wife only has 1/3 intrest in it and her sister in law and brother inlaw have 1/3 if both of them are dead does the wife gain control and is she able to sale it? tennessee

Depends upon the title. If the property is titled as joint tenants with right of survivorship, then the last surviving owner gets 100% ownership.

If the property is titled as joint tenancy or tenants in common, then each individual’s interest is controlled by that person’s will and passes to that person’s heirs.

would this info be on the doc propared after his death to divide the property

It is on the deed recorded at the courthouse.