The Duke and Duchess of Cambridge may not be included in the Queen’s “Christmas bubble” as their three young children will be considered a risk to their elderly great-grandparents, The Telegraph understands. The Queen, 94, and Duke of Edinburgh, 99, will be limited to spending the festive period with two other households, just like the rest of the nation, meaning that the traditional mass gathering at Sandringham is off the table. A final decision about who will join Her Majesty is not expected to be made for another few days but royal sources have acknowledged that factors such as the monarch’s age and relative frailty will be taken into account. The elderly couple are in the most at-risk bracket for coronavirus and have thus far been carefully shielded by what has become known as “HMS bubble,” comprising a vastly reduced staff. Buckingham Palace doctors will advise the Queen about the most sensible way forward and will be particularly mindful of the Duke’s frailty after he was hospitalised just before Christmas last year with a pre-existing condition.