What should one do if told that his father has passed away, while he believes his father is still alive?

Legal rulings are contingent upon the death of any person, and this death is established by fair evidence or by the passage of a period of time after which it is highly probable that the person would not live. However, the establishment of death is not a prerequisite for other matters such as supplicating for his forgiveness or settling his debts. It is necessary to search and inquire about the missing person's news.