When the royals are in the privacy of their own home, surrounded by just their nearest and dearest, they don't call each other by their titles.
Many have their own nicknames for each other, with Meghan Markle revealing that she calls her husband Prince Harr, Haz during an unprecedented 'tour of LA' interview with James Corden.
The Queen's immediate family have called her Lilibet for years and Prince William would refer to her as 'Gary' when he was younger as he couldn't say 'grandma'.
