noun
a male parent of one's stepfather or stepmother
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My step-grandfather graciously offered to walk me down the aisle at my wedding.
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I'm going to visit my step-grandfather this weekend to catch up on old times.
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My step-grandfather is a cool dude, always cracking jokes and making everyone laugh.
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In the family tree of life, my step-grandfather is like a sturdy branch that provides support and wisdom.