The Etruscan word nefts
Word nefts
s t f e n
Meaning nephew, grandson
See also Latin: nepōs ‘grandson, nephew’
Lemnian: naφoθ ‘nephew, grandson, descendant’
Synonyms papals

Comments
Probable borrowing from a Sabellic language in which the medial consonant cluster *-pt- developed to -ft-. A similar form is also found in Lemnian which means that the loan occured at a very early stage.

Other words that might be of interest
clan ‘son’, huσ ‘child’, atrs ‘parent’, apa ‘father’, ati ‘mother’, huσur ‘children’, σeχ ‘daughter’, puia ‘wife’, ruva ‘brother’, ata ‘grandfather’, atrś ‘house, family’, fetiu ‘fetus, offspring, child’