Declension table of ?tanutva

Neuter	Singular	Dual	Plural
Nominative	tanutvam	tanutve	tanutvāni
Vocative	tanutva	tanutve	tanutvāni
Accusative	tanutvam	tanutve	tanutvāni
Instrumental	tanutvena	tanutvābhyām	tanutvaiḥ
Dative	tanutvāya	tanutvābhyām	tanutvebhyaḥ
Ablative	tanutvāt	tanutvābhyām	tanutvebhyaḥ
Genitive	tanutvasya	tanutvayoḥ	tanutvānām
Locative	tanutve	tanutvayoḥ	tanutveṣu

Compound tanutva -

Adverb -tanutvam -tanutvāt