He was the youngest son of the writer and editor Leonard Huxley by his second wife Rosalind Bruce , and hence half-brother of the writer Aldous Huxley and fellow biologist Julian Huxley , and grandson of the biologist T. H. Huxley .
He was the half-brother of writer Aldous Huxley and fellow biologist Julian Huxley , and grandson of biologist T H. Huxley .