Final answer:
The most comforting euphemism for the word death to a relative would be 'passed away'.
Step-by-step explanation:
The most comforting euphemism for the word death to a relative would be 'passed away'. While phrases like 'bought the farm', 'kicked the bucket', and 'sleeping with the fishes' are commonly used euphemisms for death, they may not provide the same level of comfort as 'passed away', which is a more sensitive and gentle way of referring to someone's death.
Learn more about euphemisms for death