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So, if I understand you correctly, your mother was one of eight children who was your grandfather's beneficiary and your mother had eight children who shared in her estate.
If you are referring to your inheritance from your mother, which would include everything you received from your mother's estate, you would be entitled to an exemption from the Indiana Inheritance Tax in the amount of $100,000.
So, if the amount of your inheritance is less than that amount there is no inheritance tax due.
In addition, any filings related to your mother's estate would be the responsibility of your mother's Executor(trix) or Administrator of your mother's estate.