One of my friend's father has been inflicted with cancer and his situation has gotten very worse. Should we still make Dua asking Allah عز وجل to cure him since Allah عز وجل is able to do all things or should we make Dua for his Akhira since it is very unlikely that he will survive . I get similar confusions when hearing about people who are very old and they are on their death bed . Please clarify Shayk.