A Cabinet minister Talal Chaudhry says Mohammad Safdar was arrested from the Islamabad airport early Monday on his arrival from London.
Maryam said the questions taken up the Supreme Court-mandated Joint Investigation Team regarding her family businesses continue to remain questions "because they are false allegations with no answers".
"Unlike her brothers who are settled in London on a permanent basis, Maryam has political stakes in Pakistan at a personal level and she is cautious about her reputation".
NAB officials said that Safdar was presented before an Islamabad court later. The path of the vehicle carrying Safdar was obstructed by Pakistan Muslim League-Nawaz workers, as they lay on the road.
On October 2, the accountability court issued non-bailable arrest warrants against Sharif's sons and Captain Safdar for failing to appear on previous hearings.
Sharif, his children - Hussain, Hassan, and Maryam, and her husband Captain Safdar are expected to appear in court on October 9 and be indicted in the corruption cases.
Advocate Khawaja Harris told the judge that Sharif couldn't appear because he is in London, taking care of his ailing wife Kulsoom Nawaz.
Hussain Nawaz said that he had been living in London for the past 24 years and NAB could not declare him a fugitive since he had not committed any crime that he was running from.
She said that the next general elections would be held on time in 2018 and the government would complete its tenure.
Meanwhile, the court has rejected NAB's request to confiscate Safdar's passport and to issue his judicial remand, however, the accused has been directed not to leave the country without court's permission. The bank accounts and properties of the Sharif family were seized by the National Accountability Bureau sleuths.
Speaking to reporters after her appearance before the NAB court, she said she showed up before the court despite having reservations over the way the Sharif family was being subjected to accountability.