Declension table of ?pitṛbhrātṛ

Masculine	Singular	Dual	Plural
Nominative	pitṛbhrātā	pitṛbhrātārau	pitṛbhrātāraḥ
Vocative	pitṛbhrātaḥ	pitṛbhrātārau	pitṛbhrātāraḥ
Accusative	pitṛbhrātāram	pitṛbhrātārau	pitṛbhrātṝn
Instrumental	pitṛbhrātrā	pitṛbhrātṛbhyām	pitṛbhrātṛbhiḥ
Dative	pitṛbhrātre	pitṛbhrātṛbhyām	pitṛbhrātṛbhyaḥ
Ablative	pitṛbhrātuḥ	pitṛbhrātṛbhyām	pitṛbhrātṛbhyaḥ
Genitive	pitṛbhrātuḥ	pitṛbhrātroḥ	pitṛbhrātṝṇām
Locative	pitṛbhrātari	pitṛbhrātroḥ	pitṛbhrātṛṣu

Compound pitṛbhrātṛ -

Adverb -pitṛbhrātṛ