Generally, one cannot obtain title to property merely by paying the taxes. If the owner doesn't pay the taxes, then the property will be sold at public auction by the county and anyone can bid on it. If you want to own the 13 acres without buying it at public auction, then you have to buy it from the step-children who hold the title. If they have no interest in owning it, perhaps they would be willing to give you a Quitclaim Deed for little, or even no money.
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