E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Nephew (French neveu, Latin nepos).
Both in Latin and in archaic English the word means a grandchild, or descendant. Hence, in 1 Tim. v. 4, we readIf a woman have children or nephews [grand-children]. Propertius has it, Me inter seros laudbit Roma nepotes [posterity].
Niece (Latin neptis) also means a granddaughter or female descendant. (See NEPOTISM.)