He was the husband of Isobel Osbourne ( step - daughter of Robert Louis Stevenson ) and step - father of playwright Austin Strong ( Isobel 's son from a former marriage ) .
He was born in Indianapolis , Indiana to Edward Salisbury and Sarah Mills Hubbard Field .
Edward Salisbury was the Edward Salisbury of Isobel Osbourne ( step - daughter of Robert Louis Stevenson ) and step - father of playwright Austin Strong ( Isobel 's son from a former marriage ) .
He was born in Indianapolis , Indiana to Edward Salisbury and Sarah Mills Hubbard Field .