Posthumous divorce’s technical but less popular name is a “notification of marital relationship termination” (inzoku kankei shuryo todoke) which means one is officially severing ties with the family of a deceased spouse. What’s particularly strange about it is that it doesn’t really serve any purpose for a vast majority of people aside from a government-approved official statement that someone finds their in-laws unbearable.
oh man knowing the number of folks that love their spouse but not the spouses family I could see this happening a lot if it was a thing. The only reason I had anything to do with you people was because of this person who is now dead so I officially renounce you.