The author, who is releasing the paperback version of her first book, Her Heart for a Compass, confessed how much she loves reading to her grandchildren.
WATCH: Sarah Ferguson describes new granddaughter as 'very, very beautiful'
"I read them bedtime stories," she told Metro. "August is such a little chap, and I'm playing trucks with him - but if he prefers to play with Barbie dolls in the future, that's fine."
It's hardly surprising Sarah loves to read to the royal children as she launched her Storytime With Fergie And Friends YouTube channel at the start of the first lockdown in 2020. The project sees her reading a traditional children's story daily, as well as sharing arts and crafts ideas and fun recipes.
Her youngest daughter Princess Eugenie, 32, and her husband Jack Brooksbank welcomed their first child, a boy called August, in February 2021. Meanwhile, eldest daughter Princess Beatrice, 33, had baby Sienna with husband Edoardo Mozzi in September 2021.
When Sarah attended HELLO!'s Inspiration Awards in October, she couldn't help but gush over the family's latest arrivals. "Sienna, she's very, very beautiful," she said, later telling HELLO!: "It's so funny because when August smiles at me now, because he's seven and a half months, you actually know he genuinely likes you. It's not a put-on smile, he genuinely finds me very funny which is quite lucky."
Asked how gratifying it has been to watch both her daughters, Princess Beatrice and Princess Eugenie, become mothers, Sarah responded: "My children are phenomenal mothers. They were great children but now they're phenomenal mothers. And now, I have these two exceptional grandchildren all in one year.
Her Heart for a Compass by Sarah Ferguson, Duchess of York, £11.99, Amazon
"You know it's pretty incredible, but everyone asks me, 'How are your grandchildren?' Well, firstly, I look at my girls being wonderful mothers and then I see these incredible beings."
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