Answer

According to commonly accepted Jain tradition, there is no established account that any grandson of Bhagwan Rishabh Dev started or adopted another religion.

Explanation

Jain scriptures and traditional history mainly describe Bhagwan Rishabh Dev’s descendants as rulers, renunciates, and noble beings within the Jain spiritual framework. Famous names like Bharat Chakravarti and Bahubali are remembered for their roles in dharma, power, and renunciation.

If you are asking whether Jain tradition records any grandson who founded or joined a different religion, the traditional answer is: no such commonly accepted account is known.

Spiritual Understanding

In Jain Dharma, the lineage of a Tirthankar is honored for its connection with right conduct, sacrifice, and spiritual evolution. The emphasis is not on founding religions, but on progressing toward liberation through:

• Right faith
• Right knowledge
• Right conduct
• Non-violence
• Renunciation

Takeaway

So, within Jain tradition, the answer is no known grandson of Bhagwan Rishabh Dev is traditionally recognized as having started or adopted another religion.