Can my father-in-law get a haircut when he dies?

There is a folk custom that a loved one should have a haircut before his death, but he can't have a haircut for the time being after his death.

The reason why you can't get a haircut is mainly for "filial piety". At present, children's hair is born by their parents, and they have not forgotten their kindness in raising them. Until June 7, when commemorative activities were held, there was a special group spirit of "shaving seven heads", and any younger generation who "kept seven heads" could have their hair cut.