He is being investigated by police in the Philippines over claims that he kept child sexual abuse images at his home.
Pictures in media show Markle Snr being taken away in a wheelchair by the FBI.
Last week, police in the Philippines were handed a warrant by a court to start examining digital material.
The material, including devices and hard drives, was handed to the police by Thomas Markle's son, Thomas Markle Jr.
Thomas Markle Snr denies all the allegations.
It was reported by The Sun that Meghan's half-brother alleged he found a stash of images belonging to his father at his former home in the Philippines.
The report added that he also contacted the FBI in the US in July.
Markle Snr moved to the Philippines in 2025 after suffering a series of strokes.
He is now reportedly living in a rehabilitation centre in Florida.
Meghan's half-brother has been named as a "person of interest" in an investigation into child sexual abuse image allegations against Markle Snr.
Meghan recently said she was "deeply distressed" by allegations that a collection of child sexual abuse images had been found at her father's former home.
She also said that a letter containing "troubling allegations" about him had been sent to London police in 2018.
"It made troubling and disturbing allegations against my father and I was given assurances that these were being investigated," Meghan said of the letter.
"I hope it can now be understood that, despite certain media publications' distortion over the years, any distance from my father and my choice to not allow him to have contact with our children was for one reason: to protect them."
Mr Markle Jr has been approached for comment by Sky News on being named as a "person of interest" and the Sussexes declined to comment.
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Brand, 51, was found guilty of one count of rape and three counts of sexual assault at Southwark Crown Court on Thursday.
He was cleared of two further counts of rape and one count of attempted indecent assault following a four-week trial.
As Brand was taken down to the cells, his barrister Ian Winter KC confronted Sunday Times journalist Rosamund Urwin who had worked on the 2023 Dispatches investigation containing allegations against the comedian in the corridor outside Court 3.
"I hope you are pleased with yourself," he told Ms Urwin.
"I'm pleased justice has been done," the journalist was heard replying.
"Well, it wasn't. You f***ed it," Mr Winter responded, before adding: "Congratulations."
The incident happened on Thursday afternoon outside the courtroom door, with a group of journalists watching on.
In a statement issued on Friday lunchtime, Mr Winter said he has now referred himself to the Bar Standards Board, his professional regulator.
He said: "Having seen the ways matters have been characterised in today's press, I consider my professional duty requires me to self-report those allegations to the Bar Standards Board, so the matter can be subject to proper scrutiny. I have made such a report."
During the trial, Mr Winter had argued that reporting of allegations against Brand by Ms Urwin and others had "poisoned the well", and rendered it impossible for him to have a fair trial.
The trial judge, Mr Justice Bennathan, had dismissed an attempt by Brand to block his trial from taking place because of negative media coverage.
The judge ruled Brand could be tried by people who had not seen the previous media reporting.
Brand was convicted of raping a 21-year-old fan in 2009, as well as sexually assaulting three women in separate incidents between 2004 and 2009.
He is in custody and due to be sentenced on Monday.
Dino Donaldson, 22, was found guilty of murdering Anojan Gnaneswaran, 21, at Strawberry Hill station in Twickenham in 2024.
Donaldson was sentenced to life with a minimum term of 23 years in jail at Old Bailey on Friday, over the attack during which he chased the victim on to the tracks and stabbed him in the chest, abdomen and thigh.
The fight broke out on the platform between two groups of men over a drug deal worth £50 for 10 MDMA tablets.
Mr Gnaneswaran was pronounced dead at the scene.
Less than an hour after the fatal stabbing, Donaldson was captured on CCTV on a night bus smiling and laughing.
On the audio recording of a doorbell camera, he said: "I stabbed him through the back bro, I stabbed him fully. I watched it and I felt it go in him, yeah."
He was found by police hiding in a cupboard when officers came to arrest him at his home several days after the killing.
Police found 74 wraps of crack and heroin in his bedroom with a street value of more than £1,000.
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The bus was carrying children to school, said Transport Minister Philippe Tabarot, who travelled to the scene in a rural area northeast of Lyon.
The prefecture in the Ain region said 16 people were also injured, including three seriously.
"An accident involving an intercity bus occurred near Lent, France, with multiple casualties reported," the prefecture said in a statement.
"This is a bus operated by the regional authority that was transporting about 15 students" and other passengers, Mr Tabarot said.
Emergency services and law enforcement officers have been deployed to the scene near the small town of Lent, the prefecture added.
It said 102 firefighters were at the scene, along with four aircraft and eight ground-based emergency medical teams.
The town has opened its community hall to provide care and shelter to the crash victims.
"I arrived minutes after the accident and people were in shock," Yves Cristin, the mayor of the small town of Lent where the crash took place, told BFM TV.
"The side of the bus was torn off, and clearly, the people who were on that side must have been seriously injured."
French media reported the passengers included children travelling to middle and high schools in the area. A photo from the scene showed the bus had veered off the road and landed in a ditch.
French Prime Minister Sebastien Lecornu said in a post on X: "A tragic accident this morning in Lent, in the Ain department.
"Two children lost their lives and several people were injured in a bus crash.
"Thoughts to their families and loved ones, as well as to all those affected by this tragedy.
"Thank you to the firefighters, medical teams, and law enforcement mobilised on site to provide aid to the victims."
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On the sidelines of a visit to a high school in the Paris region, Education Minister Edouard Geffray said: "It is always a difficult moment when our students, our children, are victims of an accident like this.
"My thoughts, and those of the government and the entire education community, are with the families."
Calum Inglis, 34, was serving a short sentence in HMP Addiewell - run by Sodexo Limited on behalf of the Scottish Prison Service - when he tested positive for the disease on 12 October 2021.
He was asthmatic and unvaccinated against COVID-19. He was found dead in his cell at the West Lothian prison 12 days later, after his health deteriorated.
According to the Scottish Prison Service, medical care at the site is provided by the Lothian Health Board, part of the NHS.
It's alleged that in the last four days of Inglis's life, he repeatedly requested medical attention by using his cell intercom, and was promised by the prison officers that someone would see him in the morning, but it did not happen.
On Friday, Sodexo and Lothian Health Board admitted to criminal charges of failing to ensure they had adhered to their duties under health and safety legislation.
Inglis's family, through their solicitor Aamer Anwar, said their loved one was treated "worse than an animal".
Speaking after the hearing, Mr Anwar said: "Left caged, terrified and alone, repeatedly pressing at [an] intercom, screaming for help, coughing up blood.
"He was left to die alone and without dignity for 12 days, without any support from prison officers or healthcare staff from Lothian Health Board."
His mother Jennifer Inglis, a former nurse, said: "Knowing how my boy must have suffered in his cell for 12 days, it is something that will haunt me for the rest of my life.
"He was not just a prisoner. He was my son, a brother, an uncle, and a nephew. He was loved, he mattered."
The case - believed to be the first prosecution of its kind in Scotland, after the Crown Office investigated around 6,000 deaths related to coronavirus - was heard at Edinburgh Sheriff Court before Sheriff Julius Komorowski.
A Sodexo spokesperson said: "We extend our deepest sympathies to the family and loved ones of Calum Inglis following his death at HMP Addiewell in October 2021.
"However, as the legal proceedings have not yet concluded, it would be inappropriate for us to comment any further at this time."
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From March 2020 to February 2023, 215 prisoners died in English and Welsh prisons having tested positive for COVID-19 or where the disease was a contributing factor, according to HM Prison and Probation Service statistics.
According to the Scottish Government, there were a total of 17 deaths in prison custody in Scotland that involved coronavirus.