The court had also summoned Mr Sharif's sons - Hussain and Hassan - but they will not be appearing today as they are still in London tending to their mother, who is undergoing cancer treatment.
Nawaz Sharif had expressed boldness and returned to the country for facing the cases, he said while talking to a private news channel.
Former Pakistani Prime Minister Nawaz Sharif has returned to Islamabad after a month in London, arriving in the capital a day before his scheduled appearance at an accountability court over corruption allegations that led to his disqualification from office for life.
He went on to say that PML-N has always respected courts and it was, is and will remain united under the leadership of Nawaz Sharif. The latter spent a considerable amount of time at Punjab House after holding a one-on-one meeting with the former prime minister.
Earlier, Sharif skipped a court hearing last week to defy the cases.
The sources said that the former prime minister was not feeling comfortable due to a knee ailment, and was seen sitting in an unusual posture since he was unable to bend his legs.
On the occasion Ch Parvez Elahi said that Shehbaz Sharif and Rana Sanaullah are accused in Model Town massacre and if they are punished then in future nobody will dare to drop blood of innocent people.
Dar had been attending the UN General Assembly in NY with Prime Minister Shahid Khaqan Abbasi for the past week. During the meeting, Mr Sharif made a decision to take PML-N's allies into confidence and is expected to hold meetings with them soon.
Sharif, his daughter Maryam, sons Hussain and Hasan, and son-in-law MNA Capt (retd) Safdar have been summoned by an accountability court tomorrow.
On 28 July, a five-judge larger bench of the Supreme Court, while disqualifying Sharif under Article 62 (1)(f) of the Constitution had asked the NAB to file four references in the Rawalpindi accountability court within six weeks on the basis of the material collected and referred to by the Joint Investigation Team (JIT) as well as that already available with the Federal Investigation Agency and the NAB.