Her Majesty will be joined by Prince Harry, Prince William and their father Prince Charles at the meeting at her private Norfolk estate of Sandringham.
On Monday, the Queen will host an emergency summit with senior royals and Prince Harry to find a solution to Meghan and Harry’s future roles.
Duchess Meghan is in Canada, where the couple left their son Archie when they returned to the U.K. after their break from royal duties. It is believed that she will phone in.
The summit will allow the royals to “talk things through” in person, as they consider a “range of possibilities” put together by aides in the past few days.
A royal source said: “The family will gather on Monday at Sandringham to talk things through, attended by Her Majesty, the Prince of Wales, the Duke of Cambridge and the Duke of Sussex.
“Following a series of meetings and consultations across the last few days, there is a range of possibilities for the family to review which take into account the thinking the Sussexes outlined earlier in the week.
“As we have said previously, making a change to the working life and role in the monarchy for the Duke and Duchess of Sussex requires complex and thoughtful discussions.
“Next steps will be agreed at the meeting, the request for this to be resolved at pace is still her Majesty’s wish – the aim remains days not weeks.
“There is genuine agreement and understanding that any decision will take time to be implemented.”
Their meeting will be the first time they’ve all been together since Remembrance Day weekend in November.
On Wednesday, Prince Harry and Meghan announced their intention to step back as senior royals. The couple revealed they plan to become financially independent and will split their time between the UK and North America.