While and Peter Philips are known for their remarkably close sibling bond, they have another sister with whom it is believed they rarely interact with. For Felicity Wade, 37, née Tonkin, was the love child of Captain Mark Phillips, the former husband of - making her a half-sister with Zara, 42, and Peter. She was reportedly conceived after Mark had a one-night stand with art teacher Heather Tonkin in 1984 - while still married to the princess.
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