According to Jain tradition, Lord Mahavira, the 24th Tirthankara, had an elder brother named Nandivardhana and a sister named Sudarshana. There is no mention in Jain scriptures of Mahavira having a sister named Dharini. The names and details of Mahavira’s family are well established in Jain texts, and "Dharini" is not listed among his immediate family members.

Therefore, Dharini was not Mahavira’s sister according to Jain tradition.