There are three questions in your question. First, you have no right to inherit. You have the right to inherit. Second, you didn't mention the heirs and wills of your father, grandmother and mother. Third, the ownership of real estate is not just a question of who bought it in full.
Under normal circumstances, the property is the property of husband and wife, and your father accounts for half. After his death, there were several heirs, just a few, and your grandmother had only one.
If you die again, this share will be divided equally among her heirs, and the diluted share will be very small.
Coal mine refers to a place rich in coal resources, usually refers to a factory that produces coal through underground mining or open-pit mining. The fo