Even if family members have heard about these arrangements, once the person has died and there is nothing in black and white to serve as proof, the other party can always just deny it, and the family will be without legal recourse.
家人縱然有所耳聞，然而一旦人死了，在沒有白紙黑字、登錄確鑿的情況下，對方若是不認帳，家人往往催討無門。