Princes William and Harry agreed to divide the proceeds from the memorial fund of their mother, Princess Diana, The Guardian reported.
The corresponding agreement was reportedly signed in December last year between the princes' foundations.
This happened shortly before Prince Harry and Meghan Markle announced they intend to step back as senior members of the royal family and become financially independent.
In April 2013, the Royal Foundation charity assumed legal control of the Diana, Princess of Wales Memorial Fund to protect any future income upon the ending of its operations.
"The fund is no longer actively fundraising, but it is understood to occasionally receive some legacies and donations, with the bulk of its money originally going to charities chosen by William and Harry," The Guardian reported.
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