Declension table of ?apitṛka

Masculine	Singular	Dual	Plural
Nominative	apitṛkaḥ	apitṛkau	apitṛkāḥ
Vocative	apitṛka	apitṛkau	apitṛkāḥ
Accusative	apitṛkam	apitṛkau	apitṛkān
Instrumental	apitṛkeṇa	apitṛkābhyām	apitṛkaiḥ apitṛkebhiḥ
Dative	apitṛkāya	apitṛkābhyām	apitṛkebhyaḥ
Ablative	apitṛkāt	apitṛkābhyām	apitṛkebhyaḥ
Genitive	apitṛkasya	apitṛkayoḥ	apitṛkāṇām
Locative	apitṛke	apitṛkayoḥ	apitṛkeṣu

Compound apitṛka -

Adverb -apitṛkam -apitṛkāt