This is the 224th most frequent Norwegian word.
sønnen
"The son."
Here, 'sønnen' is used to specifically refer to 'my son', as 'min' is the possessive pronoun.
Sønnen min liker å spille fotball.
My son likes to play football.
'sønnen sin' is used to refer to 'her son', where 'sin' connects possessively to the subject.
Hun besøker sønnen sin hver helg.
She visits her son every weekend.
'sønnen til naboen' specifies that the son belongs to the neighbor, using a descriptive phrasing.