My sister passed away suddenly last year in Indiana, she did not have burial insurance. A family friend donated their plot for my sister. My sisters two grown children made arrangements to make payment for the opening and closing of the grave. Apparently they have not been making payments. I live in Oklahoma, my Mother called and told me the cemetery is threatening to dig up and move my sister for non-payment. I emailed them and ask if they had the legal right to do that. They emailed me back and said, they do. My question is, if the plot is payed for, can the cemetery move my sister for non-payment of the opening and closing of the grave?