ṛ-stems
ṛ-stems are predominantly agental derivatives like dātṛ 'giver', though also include kinship terms like pitṛ́ 'father', mātṛ́ 'mother', and svásṛ 'sister'.
| Singular | Dual | Plural | |
|---|---|---|---|
| Nominative | pitā́ | pitárāu | pitáras |
| Accusative | pitáram | pitárāu | pitṝ́n |
| Instrumental | pitrā́ | pitṛ́bhyām | pitṛ́bhis |
| Dative | pitré | pitṛ́bhyām | pitṛ́bhyas |
| Ablative | pitúr | pitṛ́bhyām | pitṛ́bhyas |
| Genitive | pitúr | pitrós | pitṝṇā́m |
| Locative | pitári | pitrós | pitṛ́ṣu |
| Vocative | pítar | pitárāu | pitáras |
Read more about this topic: Sanskrit Nouns