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nećak masculine noun nephew (your sister's son)
nećaci[pl] nephews
vidi nećak[acc] look at (my) nephew (your sister's son)
vidi nećake[acc, pl] look at (my) nephews
tri nećaka[gen] three nephews
pet nećaka[gen, pl] five nephews
o nećaku[loc] about (my) nephew (your sister's son)
o nećacima[loc, pl] about (my) nephews
s nećakom[ins] with (my) nephew (your sister's son)
s nećacima[ins, pl] with (my) nephews

See also: sestrić, nećakinja, sinovac, bratanac