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Princess Anne's children, Zara Tindall and Peter Phillips, have a lesser-known younger sister who spent her childhood on the same huge estate as the Royal pair

Zara Tindall and Peter Phillips have a very close bond with their rarely-seen sister, who also grew up on Princess Anne's sprawling country home, Gatcombe Estate

As well as having an older brother Peter Phillips, Zara Tindall also has a non-royal half-sister, who is much younger and manages to go under the radar despite her famous siblings