A Pakistan court rules on the temporary custody of the children who travelled from the UK with Sara Sharif's father.
www.bbc.co.uk
Muhammad Sharif, Sara's grandfather, told the BBC that he had been hiding the children in his home in the north-eastern city of Jhelum since their arrival on 10 August.
"Since they came from the UK, I didn't let them go," Mr Sharif told the BBC.
"I told Urfan and Beinash that they can go wherever they want to, but I will not let the children go with you. Until today, no one had asked me about the children.
"They kept asking me about Urfan, Faisal and Beinash, no one asked me about the children."
Mr Sharif had previously repeatedly denied being in touch with his son or knowing where the family was.
The BBC also spoke to sisters of Urfan Sharif, who said the children were very upset.
"The children were crying, the police were dragging them away," Farzana Malik said. "They were crying a lot and saying, 'we don't want to go, we don't want to go.'"
Eyewitnesses told the BBC that police officers raided the property just before 16:30 local time (11:30 GMT). Officers stopped traffic and prevented anyone from filming on their phones, neighbours said.
Mr Sharif accused the police of breaking CCTV cameras and the gates of his home.