She picked carnation flowers from her garden to give to the duchess and was wearing a plastic gold crown.
Both Samantha and Tom Jr say that Markle Sr deserves to play some sort of role in his new grandchild's life and Samantha says the news will have a "sobering effect" on the rest of the family.
In her most high-profile, solo charitable endeavor as a member of Britain's royal family, Meghan collaborated on a cookbook with a group of female survivors of the deadly Grenfell Tower fire.
The couple also brought with them a box of Fortnum & Mason tea, opting for the Royal Blend to match their status.
A palace spokesperson said that Ragland said she is "is very happy about this lovely news and is looking forward to welcoming her first grandchild".
She added: "It's so important that everybody put their egos aside.
Loved you since I was eight".
Meghan, who married Harry in the Royal Wedding back in May, appeared to enjoy the fitness display and was even convinced to throw an Australian Football League game ball.
Asked how she felt about the prospect of Australia becoming a republic, she said: "I'm dead against it". She did a handball.
They ate an starter of mushroom and quinoa nest, and chargrilled kangaroo, followed by a main course of wild boar, saffron risotto and barramundi.
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