The new executor of your father-in-law's estate will file the 1041 for that estate and finish wrapping things up. Your mother-in-law's return needs to be filed by her executor or personal representative. There may be a new estate for your mother-in-law or the two estates could be rolled into one. It may be a final estate return for father-in-law and a new estate return for mother-in-law. You just need to be sure that each tax entity is accounted for and filed. You may want to speak with the lawyer handling things if you don't know what you have and who is in charge.
It could be that your wife is the responsible party for both. .The IRS has a quick How Do I File a Deceased Person interactive assistant. It is very detailed and may give you additional information.
For additional assistance, please refer to Publication 559, Survivors, Executors, and Administrators.
To file an estate return or two, use TurboTax Business.
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