The genitive expresses ownership, to whom or what something belongs.
Ownership in Swedish is usually expressed by a structure called the s-genitive, but can sometimes also be expressed by alternative structures such as compounds and prepositional phrases. The s-genitive is formed by adding the genitive ending -s to the end of a proper name or to the end of a noun in its definite form.
EXAMPLES:
Lauras hund är under bordet. Laura’s dog is under the table.
Lärarens nya bil var stor och röd. The teacher’s new car was big and red.
The noun following the genitive form is always indefinite. If that noun takes an adjective, the adjective is used in its definite form (marked by the letter a).
EXAMPLES:
familjens stora hus
Marias röda rum
Lauras hund är under bordet.