In Jainism, social relationships such as those between "Derani" (younger brother's wife) and "Jethani" (elder brother's wife) are part of the broader family and community life. Jain teachings emphasize values such as respect, non-violence (ahimsa), truthfulness (satya), humility (vinaya), and harmony within family relations.

Jain scriptures and literature encourage harmonious and peaceful co-existence among all family members, including co-sisters. It is advised to:

• Avoid jealousy and competition.
• Practice forgiveness (kshama) and patience.
• Support each other in religious practices, such as taking part in Paryushan, Samayik, or Pratikraman together.
• Maintain respect and kindness in speech and actions.

While Jainism does not specifically describe rituals or rules unique to the "Derani-Jethani" relationship, it upholds the highest ideals of ahimsa and right conduct (samyak charitra) in all relationships. Living by these principles leads to peace and spiritual progress for all involved.