Attorney withdrew from the case in 05 who is executor

Someone will have to finish the probate and amoung other things seeking an appointment of someone else to serve as Personal Representative.  I presume they were probating the will of your Grandfather, the attorney withdrew in 2005, then your Grandmother passed in 2009.  I'm not clear on all of the necessary facts, but NO, your Aunt would not be able to take over for your late uncle without being appointed by the Court to do so.  It sounds like wraping up the first probate will be necessary in order to then address any issues relating to your Uncle's death.  There may be some conflict of interest issues too from the sound of things with your other Uncle living in the house, paying rent and your Aunt then inheriting anything that was going to her husband (your now deceased uncle). Sometimes everyone can get together to work up an accounting and to resolve all issues by signing off on an agreed final Decree.  Even if your uncle left everything to your aunt, there are issues that must be resolved relating to his "estate" since he has died. See a lawyer, take all copies you can find and they can help you map out a plan of action.

The executor's spouse doed not inherit the executor's duties and authority.  The successor executor of, if no successor executor is named in the Will, someone else must apply to the court to be appointed executor.