If your grandmother has died, you can call your grandfather a widower, or a man whose wife is no longer living.

When a man loses his wife, he becomes a widower. The equivalent name for a woman whose husband dies is a widow. In many cases, a man is only referred to as a widower if he has not remarried. Both a widow and a widower are described as being widowed. The feminine form of this word came first, from the Old English widewe. The Indo-European root means "be empty," which perfectly describes the grief that many recent widowers feel.

Definitions of widower
  1. noun
    a man whose wife is dead especially one who has not remarried
    synonyms: widowman
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    type of:
    adult male, man
    an adult person who is male (as opposed to a woman)
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