başhası

/baʃxasɯ/

Cases

Singular — cases of başhası
Case—plain
Nominativebaşhasıthe someone else
Genitivebaşhasınıthe someone else's
Accusativebaşhasınthe someone else (as the object)
Dativebaşhasınato the someone else
Locativebaşhasındain / at the someone else
Ablativebaşhasındanfrom the someone else

This word is itself a possessed form, so its endings take a possessive's buffer n — başhasına, başhasında — and it takes no further owner and no plural.

The endings are the same ones the pronouns wear — that page explains when each case is used.