Born on July 8, 1965, Daniel Jackson is the only living child of Melburn and Claire Jackson, archaeologists who were crushed to death while supervising the placement of a piece of Egyptian art in the Metropolitan Museum of Art.Daniel: said he was about 4½ years old in August 1969 in episode.</ref> Daniel's maternal grandfather and only living relative, Nick Ballard (played by Jan Rubeš), was a noted Dutch archaeologist and too busy to take the orphaned Jackson under his wing. Though placed in foster care, Daniel visited his grandfather in a mental institution until they had an argument over his failing career and Daniel left. Daniel became an archaeologist and linguist who speaks 23 earthly (plus several extraterrestrial) languages—he is shown speaking at least English, Russian, German, Spanish, Mandarin Chinese, Egyptian, Goa'uld, Ancient, and Unas.