do you agree in Euthanasia "mercy killing" ?

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My aunt has a bad situation right now because her dad had stroke and discovered large clots in his brain. Only the mechanical ventilator gives life to him and has only a slim chance of living. She really love her dad so much but can not decide what to do? If you are in her situation right now what would you do? Do you prefer mercy killing or you just wait for God's time???