From this passage, extract the names of Hawking's siblings, including both by birth and through adoption, and separate by bullets.

Context: Hawking was born on 8 January 1942 in Oxford to Frank and Isobel Eileen Hawking. Hawking's mother was born into a family of doctors in Glasgow, Scotland. His wealthy paternal great-grandfather, from Yorkshire, over-extended himself buying farm land and then went bankrupt in the great agricultural depression during the early 20th century. His paternal great-grandmother saved the family from financial ruin by opening a school in their home. Despite their families' financial constraints, both parents attended the University of Oxford, where Frank read medicine and Isobel read Philosophy, Politics and Economics. Isobel worked as a secretary for a medical research institute, and Frank was a medical researcher. Hawking had two younger sisters, Philippa and Mary, and an adopted brother, Edward Frank David.


Answer: The names of Hawking's siblings are:
-Philippa
-Mary
-Edward Frank David