Watch Prince William and Great British Bake Off's Mary Berry in 'One More Minute' Video for Grieving Families

Prince William appears in an emotional new video highlighting his support for grieving children and families.

In the video, which was released Friday, the royal dad poignantly pleads for people to “please, take one more minute to support Child Bereavement UK and help to rebuild the lives of bereaved families.”

William was 15 when he lost his mother, Princess Diana, in 1997. Her close friend Julia Samuel, who is the founder patron of the charity, previously told PEOPLE about

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