Linguistic, historical, and geographical conditions suggest that homogeneous communities settled in Eurasian and spoke Proto-Indo-European languages that began to expand around 4000 BCE. Mallory and some scholars believe that the Indo-European’ s homeland was in the arid steppe of the Pont-Caspian region. Having migrated the Indo-Iranian groups, they probably occupied somewhere in central Asia (a geographical parallel to Kazakhstan, Kyrgyzstan, Turkmenistan, and Uzbekistan) from where some Iranians migrated to the Iran’ s plateau, while the Indo-Aryans migrated to the subcontinent (Mallory 1989: 262). Grandson is one of the most controversial words in the Indo-European languages. This word is attested in most of Indo-European languages such as Celtic, Germanic, Italic, Baltic, Slavic, Albanian, Greek, and Indo-Iranian. In the Proto-Indo-European languages *h2nep-ō t is used for ‘ male descendant’ and h2nep-t-ih1/2 for ‘ female descendant’ . Buck believes that PIE *nepot probably consists of a compound of negative ‘ ne’ , and a form of stem, which is seen in Sanskrit pati-, Latin potis ‘ able’ , etc., and literally means ‘ powerless’ (Buck. 1944: 644). Paul Horn quotes from Leumann about PIE nē pō t which means ‘ orphan’ (Horn. 1883: 234), and Nourai regards nebh= ‘ damp, humidity’ as a root (Nourai. 2012: 322), but Helmut Rix does not think of nebh as the root of ‘ nava’ (Rix. 2001: 448)...