According to OK! Magazine, a source said that Charles “had his aides looking at custom-made cubby houses, similar to what the Queen and Princess Margaret had when they were girls”.
The source added: “He wants to give Lili something she will use and be hers. She’ll remember it forever – it’s going to be the ultimate surprise.”
It is not known whether or not the King acquiesced to Harry’s desire for a less dramatic present and Royal Family sources have remained tight-lipped about the party celebrations.
Princess Lilibet Diana’s birthday party reportedly took place at Prince Harry and Meghan Markle’s £16million home in Montecito.
Despite the King’s private plans for a lavish gift for his granddaughter, other senior royals did not share a public birthday tribute on Twitter. A royal source said this was because senior members of the Royal Family “don’t mark the birthdays of non-working members”.