What is the rule regarding the number of members from the ruling party in a jpc?

About Joint Parliamentary Committee:

• A Joint Parliamentary Committee (JPC) is set up by the Parliament for a special purpose, like for the detailed scrutiny of a subject or Bill.
• It has members from both the Houses and from both the ruling parties and the opposition.
• Members of the JPC are decided by the Parliament.
• There is no fixed number of members in the committee.
• It is dissolved after its term ends or its task has been completed.
• The recommendations made by the committee are in recommendatory in nature not binding on the government.

A 31-member Joint Parliamentary Committee (JPC) has been established to review the Waqf (Amendment) Bill, 2024. The committee will comprise 21 members from the Lok Sabha and 10 from the Rajya Sabha.

Thanks for reply۔

But the main question is whose number should be more and why?