Declension table of ?pitṛmandira

Neuter	Singular	Dual	Plural
Nominative	pitṛmandiram	pitṛmandire	pitṛmandirāṇi
Vocative	pitṛmandira	pitṛmandire	pitṛmandirāṇi
Accusative	pitṛmandiram	pitṛmandire	pitṛmandirāṇi
Instrumental	pitṛmandireṇa	pitṛmandirābhyām	pitṛmandiraiḥ
Dative	pitṛmandirāya	pitṛmandirābhyām	pitṛmandirebhyaḥ
Ablative	pitṛmandirāt	pitṛmandirābhyām	pitṛmandirebhyaḥ
Genitive	pitṛmandirasya	pitṛmandirayoḥ	pitṛmandirāṇām
Locative	pitṛmandire	pitṛmandirayoḥ	pitṛmandireṣu

Compound pitṛmandira -

Adverb -pitṛmandiram -pitṛmandirāt