In the two years since Prince Harry and Meghan Markle stepped down as senior royals - only Harry has returned to the UK.
Now they are settled in California, Meghan has not been back to visit and neither has their two-year-old son Archie, who turns three in May.
While living in the US, the couple has welcomed another addition to their family - seven-month-old daughter Lilibet - who has yet to come to the UK and meet relatives including her grandfather Prince Charles and great-grandmother the Queen.
