The Justice (retired) D K Trivedi Commission asked Asaram Bapu to remain present before it on December 1, while his son Narayan Sai, has been asked to appear on November 11.
Both of them have to depose before the commission as witnesses.
Expressing unhappiness over the father-son duo not appearing on different grounds in the past, the commission asked them to file individual undertakings to remain present without fail in the form of affidavits.
"These affidavits shall reach the commission on November 10 and be handed over to the secretary of the commission," Justice D K Trivedi said in his order.
The commission also said that at one point, it had desired to exercise its power to secure their presence as witnesses by issuing warrant.
Meanwhile, on behalf of Asaram and son, a disciple of the ashram Uday Sanghani submitted two separate applications stating that Narayan Sai expressed his willingness to appear on November 11 and Asaram was ready to appear on November 19.
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Two young boys-- Deepesh and Abhishek had gone missing from the ashram on July 3, 2008.
Two days later on July 5, they were found dead outside the ashram. Both of them were resident students at the ashram.
Following controversy over the matter, the Gujarat government had announced to set up a commission to probe the case.