Can we get a court order to exhume my mother in law and bury her in the back yard?!?

My husband has never dealt with his mother's death and misses her immensely. We want to dig her up so he can see her again and hold her and grieve and let go. She died in the winter of 1989. How do we get a court order so we can exhume her and then bury her in our back yard?