We found one dictionary that defines the word mother's line:

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1. mother's line: Wiktionary

Definitions from Wiktionary (mother's line) ▸ noun:  matriline ▸ Words similar to mother's line ▸ Usage examples for mother's line ▸ Idioms related to mother's line ▸ Wikipedia articles (New!) ▸ Words that often appear near mother's line ▸ Rhymes of mother's line ▸ Invented words related to mother's line