Declension table of ?apitṛka

Neuter	Singular	Dual	Plural
Nominative	apitṛkam	apitṛke	apitṛkāṇi
Vocative	apitṛka	apitṛke	apitṛkāṇi
Accusative	apitṛkam	apitṛke	apitṛkāṇi
Instrumental	apitṛkeṇa	apitṛkābhyām	apitṛkaiḥ
Dative	apitṛkāya	apitṛkābhyām	apitṛkebhyaḥ
Ablative	apitṛkāt	apitṛkābhyām	apitṛkebhyaḥ
Genitive	apitṛkasya	apitṛkayoḥ	apitṛkāṇām
Locative	apitṛke	apitṛkayoḥ	apitṛkeṣu

Compound apitṛka -

Adverb -apitṛkam -apitṛkāt