Phillips has an older brother , Peter Phillips ( born 15 November 1977 ) and two half-sisters , Felicity Tonkins ( born in 1985 to her father by his brief affair with Heather Tonkins ) and Stephanie Phillips , born 2 October 1997 from her father 's second marriage to Sandy Pflueger .
She has an older brother , Peter Phillips ( born 15 November 1977 ) .