"My mother in law recently passed away without a will. She had no assets except for a car. there are 3 sons but no one is fighting about anything. what do we have to do with her stuff."
That being said, and while it seems a shame to tell you to consult a probate attorney in your area, you still should. Given how small matters are you might be able to find an attorney inexpensively through the county bar association in your county. Here are some of the things to consider:
o Your mother in law might have debts and if you or the others are appointed as administrators those debts will become your responsibility to the extent of the assets in the estate.
o Most people have bank accounts, a Social Security check in transit, and other assets that you might still find if someone with some experience can help. Perhaps there is a auto insurance policy that has almost a year to run that was paid by her.
o A final income tax return may still be required for your mother in law.
o You might need to address insurance for the car in the interim.
o etc.