Is A Will Requesing The Washing And Burial Of The Corpse Binding?

Is a will requesing the washing and burial of the corpse binding?

The will of a person, which is left behind when one was healthy, to determine a specific person to wash oneself, perform one’s funeral prayer and bury, or to determine a specific place to be buried is not binding. However, relatives of the deceased person may realize this will if they wish (al-Fatawa al-Hindiyyah, I, 179).

Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWA