What are my rights in Tennessee

I certainly agree with the attorney who said you need to hire an attorney, but the short answer is this: Those things titled or deeded to your mom and her husband are his. Yes he was designated as a POD beneficiary, things like bank accounts and insurance policies may also just go to him. For those things that would pass through the probate court, and figuring that out as one of many reasons you probably will want an attorney, spouse and surviving children would equally share assets, although he gets at least 1/3. Spouse is also  entitled to one year's financial support paid by the estate "off the top," and also entitled to all the personal property in the house etc.