After sharing her “shock” diagnosis of cancer last Friday, Kate Middleton has fielded messages of support and strength worldwide—and from within the royal family. Within the small circle of the British royals, the Princess of Wales can turn to two people who are also living the dual realities of royal daily life and cancer treatment simultaneously: King Charles, who shared his own cancer diagnosis in February, and Sarah Ferguson, Duchess of York, who has herself been diagnosed with both breast cancer and skin cancer within the space of one year.

Ferguson, 64, shared a statement of support for the ailing princess Monday on her Instagram account.

In a simple text image, Ferguson wrote, “All my thoughts and prayers are with the Princess of Wales as she starts her treatment. I know she will be surrounded by the love of her family and everyone is praying for the best outcome.”

Ferguson herself has been candid about her own cancer battles and treatments, speaking openly about undergoing a mastectomy and breast reconstruction, as well as advocating for skin checks with her more recent skin cancer diagnosis. She praised Kate for coming forward to the public about her health.

“As someone who has faced their own battles with cancer in recent months, I am full of admiration for the way she has spoken publicly about her diagnosis and know it will do a tremendous amount of good to raise awareness,” Ferguson’s statement continued. “I hope she will now be given the time, space, and privacy to heal.”

Charles, too, has shared a public statement of support for his daughter-in-law, saying Friday that he is “so proud of Catherine for her courage in speaking as she did.”

Sources close to the royal family tell Vanity Fair that Kate and the king are “closer than ever” as they fight the same condition.