Masculine:
* Brat (nominative singular)
* Brata (genitive singular)
* Bratu (dative singular)
* Brata (accusative singular)
* Bratom (instrumental singular)
* Bratu (locative singular)
Feminine:
* Sestra (nominative singular)
* Sestre (genitive singular)
* Sestri (dative singular)
* Sestru (accusative singular)
* Sestrom (instrumental singular)
* Sestri (locative singular)
Note:
* The word "brat" is used for both "brother" and "male sibling" in Serbo-Croatian.
* The word "sestra" is used for both "sister" and "female sibling" in Serbo-Croatian.
* The words above are in the singular form. In the plural form, the ending changes depending on the case.
Examples:
* Moj brat je stariji od mene. (My brother is older than me.)
* Želim da vidim svoju sestru. (I want to see my sister.)
* Dao sam knjigu svom bratu. (I gave the book to my brother.)
* Razgovarao sam sa svojom sestrom. (I talked to my sister.)