PTI founder Imran Khan's son Kasim Khan has said he and his brother Suleiman have applied for their visas and are planning a trip to Pakistan in January, while also commenting on the conditions in which the ex-premier was kept and saying that he was being held in a "death cell".

The remarks were made during an interview to Yalda Hakim for Sky News, which came as another sit-in held outside Adiala jail by Imran's sisters over being denied a meeting with him was dispersed using water cannons; the party alleged that authorities used "chemical-laced" water.

As court-ordered prison visits stay blocked, Imran's family and party have expressed concerns about the conditions in which he is being kept inside the prison. A United Nations' special rapporteur has also warned that Imran is being held in conditions that could amount to inhuman or degrading treatment.

During their interview with Hakim, released early on Wednesday, Kasim and Suleiman, who live in London, were asked whether they had tried to engage with the Pakistani government to get permission to visit Imran.

Hakim also noted that they had previously talked about "being warned not to come" even though Defence Minister Khawaja Asif had said they "were welcome to come and can visit him [Imran]".

At that, Kasim replied: "We are now planning to because they said it openly. So — unless they go against their word — we should be hopefully going in January. We have applied for our visas. […] It hasn't come through yet. We are expecting it to come through, so we are planning a trip in January."

Hakim then asked them what they would say to Imran upon seeing him, and whether they would ask him to consider "cutting a deal".

But Kasim explained that "what you have to understand is it's his life. It's literally his passion and his goal. He calls it his life's purpose to help rid Pakistan of corruption".

Asked what else they would want to say to Imran or what message they would like to send to him, Kasim said, "I want to know how we can get him out, how we can help because the main point is we feel so helpless at this point. I mean, there's so much to catch up on."

When Hakim asked them whether they think Imran "will ever get out", their reply was not too optimistic.

"The conditions are getting worse. The people in power are becoming more entrenched. So, it's very hard to see a way out and a lot of the people we speak to […] are seeming less and less confident every time we speak to them.

Suleiman said the cell in which Imran was kept had been described as a "death cell".

They were also asked about "what went through their minds" when they came across rumours about Imran's possible death on social media.

Suleiman described that experience as "incredibly stressful".

The duo also shared that they were looking to do more advocacy and visit Brussels or Geneva in January to speak to politicians and officials about Imran's situation.