Madison, GA Estate Planning Law Firms & Lawyers

This is somewhat too complicated to answer on a website. It's not clear what you mean when you say mother was instructed to "sign over" her part of the estate, but there are ways that could be done. Your father's estate passes as set forth in his will.

Your question does not make sense as asked. Your parents would not have one estate, they would have two separate estates (assuming they are both deceased). If they passed away in or before 2004, their estates should not still be open. The estates should have been administered, and all property distributed, by now.  

If your mother named you as the POD beneficiary on an account, that account belongs to you, and it does not become part of your mother's probate estate. It DOES become part of her estate for estate tax purposes, so if your mother's estate was large enough that an estate tax return is required, or if she was married and the Executor wants to allow her surviving spouse to use her remaining estate tax exemption and so an estate tax return is needed, then the Executor would need information about what was held in any such account at the date of your mother's death. But the Executor is not entitled to the funds. They're yours.