The couple will keep their multi-million dollar home in Montecito, about a two-hour drive north of Los Angeles. Meghan's mother, Doria Ragland, who has been heavily involved in helping to care for her grandchildren, will remain living in California.
The family is expected to return to the US regularly as well as use the holiday home they have bought near Melides in Portugal.
It is close to a property bought by Princess Eugenie and her husband Jack Brooksbank who have remained close to the Sussexes during the royal fallout.
How involved Harry, Meghan, Archie and Lilibet will be with the wider royal family has not yet been decided.
Over the next few months, several significant royal engagements are in the diary that would involve most senior royals - Remembrance Sunday at the Cenotaph, the Princess of Wales' Carol Service at Westminster Abbey and then Christmas at Sandringham.
Will there be invitations extended to the Sussex family?
Trust remains an issue. There is caution, a degree of wariness and even hostility in some quarters of the Royal Household. These decisions are very much a work in progress.
Harry and Meghan's team has described the move to the UK as being for "an extended period of time".
It is not necessarily a long-term move but may be a chance for the family to experience life in the UK, allowing the children to get to know their grandfather, the King, while they are young enough to not have their education disrupted.
Much of what happens in the months ahead will be a test - of Harry and Meghan's liking for life in the UK, of public reaction to them and of the royal family's ability to continue with their duties alongside the distractions the Sussex family may bring.
Additional reporting by James Govan.

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