Yes. According to Jain tradition, Bhagwan Mahavira had two elder siblings:

• Elder brother: Nandivardhana
• Elder sister: Sudarshana

Both Śvetāmbara and Digambara accounts generally accept that Mahavira (Vardhaman) was the youngest child of his parents, King Siddhartha and Queen Trishala, with these two elder siblings.

You can read a simple overview of Mahavira’s life here