Niece would be an opposite as a niece is female and a nephew is male.
nephew
In English cousin denotes a family relationship, it is not gender specific.
The feminine opposite of nephew is niece.
He would be your nephew. The boy is your nephew.
Niece would be an opposite as a niece is female and a nephew is male.
There is no "opposite" of a nephew, unless you say that since a nephew is male, the opposite is a niece, who is female.
Nephew is the opposite of cousin
niece
NIECE
nephew
Niece would be an opposite as a niece is female and a nephew is male.
The opposite relationship of uncle would be Niece or Nephew.(The opposite gender is aunt.)
neice
In English cousin denotes a family relationship, it is not gender specific.
The feminine opposite of nephew is niece.
Your nephew's nephew is the son of one of your nephew's brothers or sisters. He is your great nephew.