Declension table of pātṛ

Masculine	Singular	Dual	Plural
Nominative	pātā	pātārau	pātāraḥ
Vocative	pātaḥ	pātārau	pātāraḥ
Accusative	pātāram	pātārau	pātṝn
Instrumental	pātrā	pātṛbhyām	pātṛbhiḥ
Dative	pātre	pātṛbhyām	pātṛbhyaḥ
Ablative	pātuḥ	pātṛbhyām	pātṛbhyaḥ
Genitive	pātuḥ	pātroḥ	pātṝṇām
Locative	pātari	pātroḥ	pātṛṣu

Compound pātṛ -

Adverb -pātṛ