Declension table of ?ekaputra

Masculine	Singular	Dual	Plural
Nominative	ekaputraḥ	ekaputrau	ekaputrāḥ
Vocative	ekaputra	ekaputrau	ekaputrāḥ
Accusative	ekaputram	ekaputrau	ekaputrān
Instrumental	ekaputreṇa	ekaputrābhyām	ekaputraiḥ ekaputrebhiḥ
Dative	ekaputrāya	ekaputrābhyām	ekaputrebhyaḥ
Ablative	ekaputrāt	ekaputrābhyām	ekaputrebhyaḥ
Genitive	ekaputrasya	ekaputrayoḥ	ekaputrāṇām
Locative	ekaputre	ekaputrayoḥ	ekaputreṣu

Compound ekaputra -

Adverb -ekaputram -ekaputrāt