"Daughter-in-law Grandpa's mother"@en . "Grandpa's grandfather is a fictional character in the Hey Arnold! TV Series. He lived from 1830-1921. His father lived from 1800-1891. \"That's the trouble with our society \u2014 no work ethic!\" That's just how Grandpa's grandfather taught his grandson, just as Grandpa passed it down to Arnold. His name is never known."@en . . . . . "Unknown"@en . "Grandpa's grandfather is a fictional character in the Hey Arnold! TV Series. He lived from 1830-1921. His father lived from 1800-1891. \"That's the trouble with our society \u2014 no work ethic!\" That's just how Grandpa's grandfather taught his grandson, just as Grandpa passed it down to Arnold. His name is never known."@en . . "Grandpa's grandfather"@en . . "Unknown"@en . "Unknown"@en . ""@en . "Great-grandson Miles"@en . "Great great grandson Arnold"@en . "Grandpa's grandfather"@en . "Granddaughter Mitzi"@en . "Great-granddaughter-in-law Stella"@en . "Son Grandpa's father"@en . "Grandson Phil"@en . . "Grandpa's grandfather"@en . . "Granddaughter-in-law Gertrude"@en . "Unknown"@en .