Entries linking to grandma
The extension of the sense to corresponding relationships of descent, "a generation younger than" (grandson, granddaughter) is from Elizabethan times. The inherited PIE root, *nepot- "grandchild" (see nephew) has shifted to "nephew; niece" in English and other languages (Spanish nieto, nieta). Old English used suna sunu ("son's son"), dohtor sunu ("son's daughter").
1707, spelling variant of mamma. Meaning "sexually attractive woman" is attested by 1925 in African-American vernacular. Mamasan "woman in a position of authority," especially "woman in charge of a geisha-house" is by 1949, with Japanese san, an honorific title. Mama mia! as an exclamation of surprise, etc. is by 1848, from Italian, literally "mother mine!"