Possessive adjectives can be formed from proper nouns or nouns denoting people:

	Antun	Antunov	Antunov brat	Antun's brother
	Marko	Markov	Markov novi auto	Marko's new car
	putnik	putnikov	putnikov šešir	the passenger's hat

If the final consonant is 'soft', the suffix becomes -ev:

Feminine nouns ending in -a drop the final and replace it by -in:

These possessive adjectives are then declined like regular definite¹ adjectives with the appropriate endings added to the new suffix:

Antunova sestra je ovdje   -   Antun's sister is here
Vidjela sam markovog brata  -  I saw Marko's brother
Jesi li to rekao putnikovoj sestri?  -  Did you tell that to the passenger's sister?

NB: These forms cannot be preceded by a qualifying adjective:

             Ovo je putnikova torba 
but        To je torba onog drugog putnika

Examples:

Je li Slavko Jasnin muž?                    Ne, Slavko je Marijin muž.

A kako se zove Alanova žena?           Zove se Nora.

Tko je mali Ranko?                             On je Marijin nećak.

Gdje živi dječakova baka?                  U Zadru, živi s marijinom mlađom sestrom.

Je li to ranije bila Antunova kuća?    Jest, a Babićevom trgu.

¹You will also find indefinite endings for masculine possessives.