Mich. Comp. Laws § 456.112

Sec. 12. All rights of burial granted by such corporation shall be transferable and as fully alienable as any other personal property in this state, subject only to such conditions in reference thereto as shall be prescribed by the board of directors and subject to rights of the surviving spouse and next of kin now existing at law or in equity as to any individual burial space or grave in which there is an actual interment.