Beatrice left home when Mills was nine years old, to live with the actor Charles Stapley, which left her, her older brother Shane, and her younger sister, Fiona, in the care of their father.Click to see full answer. Then, who is Beatrice McCartney’s mother? Heather Mills Beside above, how much is Beatrice McCartney worth? Beatrice McCartney’s net worth is $100,000 – $1M. Similarly, what age is Beatrice McCartney? 16 years (October 28, 2003) Who is Heather McCartney’s biological father? Joseph Melville See Paul McCartney