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Prince William and Prince Harry's aunt, Lady Sarah McCorquodale, suffered a serious fall from her horse last month, her brother Charles Spencer has revealed

The 9th Earl Spencer said Lady Sarah, 70, has been in the hospital "for a long time," during an appearance on the Rosebud with Gyles Brandreth podcast

A friend tells PEOPLE Lady Sarah — the eldest sister of the late Princess Diana — is "on the mend" following the accident

An aunt of Prince William and Prince Harry is recovering after a "really bad" fall from her horse.

Lady Sarah McCorquodale , who is the eldest sister of the late Princess Diana , fell and seriously injured herself last month.

Her brother Charles Spencer revealed the accident during a chat on the Rosebud with Gyles Brandreth podcast on

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