Just put yourself in his shoes. Would you want your children to worry over something that was totally beyond their control, frustrate themselves? Or is it a better way to spend time to make the best use of the time left?
Draw on what he has taught you as a father, and as a friend. Use the time to realign your values and ask yourself, "What parts of my father would I like my children to embody."
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former owner...now I'm just another
schmuck