noun
a person's grandmother who is the stepmother of one of their parents
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My step-grandmother is a kind and generous woman who has always treated me like one of her own grandchildren.
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I'm going to visit my step-grandma this weekend, she always bakes the best cookies.
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My step-granny is the coolest, she's always up for a good time.
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In the family tree of my life, my step-grandmother is like a beautiful branch that adds more love and support.