Doria Ragland – the only member of Meghan's family at her wedding – is said to be "beside herself for excitement" to become close to Harry and Meghan.
A friend said yesterday that he could make the move as soon as next month, in time to celebrate his 62nd birthday in Britain.
It is said that Doria was deeply impressed by the royal family, including the queen, during and after Meghan's marriage.
His hidden joy has also conquered his millions of fans. Unlike her ex-husband Thomas Markle and other relatives who cashed her wedding with a series of direct interviews, she never publicly uttered a word about her daughter's fairy tale story.
Doria has already laid the groundwork for his departure in London. In May, he quit his job as a social worker for Didi Hirsch's mental health services clinic in Culver City, Los Angeles. She was also sighted with a security guard.
A dear friend from Los Angeles said last night: "She's getting ready to move to London, I think it will be as soon as possible, I know she was eager to live closer to her daughter.
"She did not stay at her house for a while, she only visited the house occasionally and when she is there she had a security guard with her. He has been with her since about November.
"He is fiercely loyal to Meghan and he would never have betrayed her like everyone else.
"She also fell in love with England and told me when she came back that she is somewhere that she believes she can live happily too.
"I think this came a while. Even before the wedding he told me how he missed her Megs so much that he would do anything to be closer to her, especially now that Meghan will start a family of her own ".
Another neighbor in the elegant and appropriately named Windsor Hills LA added: "Doria and Meghan have always been inseparable, Doria is beside herself for excitement at the thought of moving to London.
"I bet Meghan is just as excited about having her mother close, especially when she and Harry have kids, and Doria will be an absolutely amazing grandma."
Another friend of Doria said: "He might seem shy on TV at Windsor Castle, but it's a real thread, full of enthusiasm, I can not think of someone who does not like her."
Meghan, who grew up in Windsor Hills, talked about her birthplace in the interviews, saying she misses the LA lifestyle of "palm trees, the warmth of the sun and the ocean breeze".