Their further destination, whether they will be taken to Islamabad or Lahore in Pakistan, is not known yet. "I am giving this sacrifice for your future generations...for Pakistan's future", Nawaz added.
Nawaz Sharif on-board flight had said, "I'll be taken straight to jail. Let's build destiny of Pak together".
The duo, who are convicted in Avenfield reference case, will stay at the Abu Dhabi airport for seven hours and will reach Lahore at 6.15pm (2.15 United Kingdom time), sources said.
Nawaz Sharif and Maryam Nawaz arrived in London prior to Eid-ul-Fitr and are now there due to Kulsoom Nawaz's prolonged illness.
Meanwhile, flights that were to arrive at Islamabad airport this morning have been diverted to Lahore airport.
Speaking to media persons outside London's Harley Street Clinic, Hussain said that his mother opened her eyes for a few seconds only to close them again; however, she is in a better state now and doctors have adjusted the settings on the ventilator.
The crackdown on the PML-N, whose leaders have accused the military of attempting to destabilize the party, comes a day before the party founder, ousted Prime Minister Nawaz Sharif, is due to return to Pakistan where he faces arrest.
His remarks came days before the general elections in Pakistan and days after an anti-corruption court in Pakistan held Nawaz Sharif guild in the Avenfield corruption case and sentenced him 10 years in jail.
Earlier on Thursday, Sharif had a farewell meeting with former finance minister Ishaq Dar in London, before leaving for Abu Dhabi.
While talking to the reporters, Hussain Nawaz told, " Ami has opened her eyes after one month". I don't have anything else to share.
Pakistan Muslim League-Nawaz (PML-N) leader Maryam Nawaz Sharif tweeted, "Told my kids to be fearless in the face of oppression".
The photograph, which was tweeted by a Pakistani journalist, and retweeted by Nawaz Sharif's daughter, shows Maryam breaking down as her father Nawaz Sharif keeps his hand on Begum Kulsoom's forehead, hours before they head to the airport to return to Pakistan, where they would be arrested upon arrival.
Sharif, who was disqualified by the Supreme Court a year ago in the Panama Papers case, is now the supremo of the PML-N.