From The Guardian:
Nicholas Hughes, the son of the poets Sylvia Plath and Ted Hughes, has hanged himself at the age of 47. The former fisheries scientist at the University of Alaska Fairbanks had carved out a successful scientific career in one of the remotest parts of the western world, but ultimately he could not escape the legacy of being the offspring of one of the most famous and tragic literary relationships of the 20th century.
Those who know little else about his mother know that she was the American-born poet who gassed herself in the kitchen of her north London home in February 1963 while her one-year-old son and his two-year-old sister, Frieda, slept in their cots in a nearby room. Plath had placed towels around the kitchen door to make sure the fumes did not reach her children. She had been distraught at the break-up of her relationship with Hughes, following her discovery of his infidelity. Six years after their mother's death, in 1969, their father's then partner, Assia Wevill, also killed herself, killing her four-year-old daughter Shura in the process.
More here.