The difference between Eldfather and Eldmother
When used as nouns, eldfather means one's grandfather or forefather, whereas eldmother means one's grandmother or other female ancestor, or one's mother-in-law.
check bellow for the other definitions of Eldfather and Eldmother
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Eldfather as a noun (dialectal, now, archaic):
One's grandfather or forefather.
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Eldfather as a noun (obsolete):
One's father-in-law.
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Eldmother as a noun (dialectal, now, archaic):
One's grandmother or other female ancestor, or one's mother-in-law.