Well, yeah, but if i won't be able and noone from my relatives know about my funds and they don't have any idea what crypto is. Is any way for them to receive money?
Well, they should know about crypto then. At least know how to withdraw your funds and exchange it into fiat when they need it. There is no other way, trusting another person or institution to do it for you has more risks than benefits. You should educate them while you still can.