The difference between Paternal grandchild and Paternal grandfather
When used as nouns, paternal grandchild means the child of a man's son: a grandchild to whom one is the paternal grandfather, whereas paternal grandfather means the father of one's father.
check bellow for the other definitions of Paternal grandchild and Paternal grandfather
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Paternal grandchild as a noun:
the child of a man's son: a grandchild to whom one is the paternal grandfather
Examples:
"Men who become fathers later in life may pass a mark of longevity down to their paternal grandchildren."
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Paternal grandfather as a noun:
The father of one's father.