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The car would be considered part of her estate, as would the jewelry and her personal items. It would be divided according to rules set up by the state as your mother had no will.
In Indiana, when a person remarries, their children and current spouse split the monetary value of the property. He would be entitled to half, and you would be entitled to half. If you and he can agree on how things are split, you could keep the car. He is not entirely entitled to it. If you all cannot agree, the court
would order everything sold and the proceeds split.
In order to title the car in your name, you'll have to open your mother's estate. You can hire a lawyer to do that or you can use forms , like those found here
Also, the probate court where your mother resided may have forms and guides to help. Check with them as well.
If you have more questions please feel free to ask. I'll be happy to answer them. If you do not, please do remember to rate my service in assistance to you today.