According to Express, the last time Prince George was pictured with his grandfather was in June, on the balcony of Buckingham Palace during Trooping the Colour.
However, Kate's parents regularly mind Prince George, Princess Charlotte and Prince Louis when their parents attend royal events.
When the Duchess of Cambridge attended the women’s final match at Wimbledon in July, Prince George and Princess Charlotte were spotted enjoying a local festival with their grandparents Michael and Carole Middleton.
Michael and Carole also babysat the royal children in August, while William and Kate competed in the King's Cup regatta at Cowes, Isle of Wight.
Now, with rumours that William and Kate are set to upgrade to a bigger home within the Kensington Palace property, it looks like this might be the proof we’ve been waiting for that Kate has another baby on board.
Late last week, removal trucks were noticed outside Apartment 1 in the Kensington Palace complex – the abode next door to the Cambridges’ home, Apartment 1A. Since 1972, the Queen’s cousin, Prince Richard, and his wife have been living in the huge 21-room residence.
WATCH: Kate Middleton shows rare intimate moment with William
The Duke of Cambridge fuelled the pregnancy rumours earlier this week, too, when he was seen on his way to church in Scotland with the Queen.
The pair’s presence – along with an absence of Catherine – sparked talk Wills was at Balmoral Castle to share the exciting news with his grandmother before it became public knowledge, as is the tradition.