Hassan Nawaz, the younger son of Pakistan Prime Minister Nawaz Sharif, appeared before the Joint Investigation Team (JIT), which is probing the Panama Papers case, on 2 June.
This was his first appearance before the JIT at the Federal Judicial Academy, reports the Dawn.
Hassan's elder brother Hussain Nawaz has appeared before the JIT thrice in the past five days to answer questions regarding the Sharifs' London properties.
On 1 June, he was told that he would be summoned for a fourth time soon.
The JIT, constituted by the Supreme Court, has been probing the Panama Papers case. It also sought answers from Qatari royal Hamad Bin Jassim Bin Jaber Al-Thani with regard to two letters signed by him and presented before the Supreme Court by representatives of the prime minister's children.
The apex court has also been monitoring the proceedings of the JIT on fortnightly basis.