Declension table of ?saptaputra

Masculine	Singular	Dual	Plural
Nominative	saptaputraḥ	saptaputrau	saptaputrāḥ
Vocative	saptaputra	saptaputrau	saptaputrāḥ
Accusative	saptaputram	saptaputrau	saptaputrān
Instrumental	saptaputreṇa	saptaputrābhyām	saptaputraiḥ saptaputrebhiḥ
Dative	saptaputrāya	saptaputrābhyām	saptaputrebhyaḥ
Ablative	saptaputrāt	saptaputrābhyām	saptaputrebhyaḥ
Genitive	saptaputrasya	saptaputrayoḥ	saptaputrāṇām
Locative	saptaputre	saptaputrayoḥ	saptaputreṣu

Compound saptaputra -

Adverb -saptaputram -saptaputrāt