1.第一句的not 是并列否定词,等于 they can not get any money from me before I die.
2.before I die.是时间状语从句,用一般时表将来.
before the relatives have been told.还是时间状语从句,用现在完成时表将来完成的动作.
例句： It will be two years before we meet again. 要过两年我们才能再见.
You can't go out to play before you have finished your homework.要等到你做完作业才能出去玩.