Inheritance. What, exactly, will I be entitled to?

We've been married 30 years. My husband inherited a farm when his father died before we married. I understand that is his and is not considered marital property. At what point does it become marital property? OR does it ever? We moved to the farm 23 years ago and have lived here ever since. We sold 20 acres when we first moved here to pay down debt. We recently sold another 16 acres because his mother talked him into it for whatever reason. I was not included in that decision because I am not counted as having a voice in anything to do with the farm. I kept quiet up until my husband offered me half of the sale price to just leave since I was entitled to it since he sold it after we married. This tells me he has already consulted a lawyer. We mortgaged another 20 acres to build the house we live in now. This leaves around 25 acres that is unsold and unmortgaged. He has a sizeable 401k, which he started about 15 years ago. Am I entitled to anything? We're in Tennessee.