18. Kathleen Kennedy & Husband

politico.com

The fourth child, Kathleen Kennedy, had a slightly more promising life because she wasn’t institutionalized. Her career led her to be appointed to the position of Ambassador to the United Kingdom. While she was in London obliging her duties, she met her husband William Cavendish, Marquess of Harington. The couple married in May 1944 but he was killed in action only four months later. William died by sniper fire in Belgium, right before the war ended, just like her brother Joseph Jr. Before his death he wrote to Kathleen expressing the deepness of the love he had for her, “so unworthy of it all living as I have in reasonable safety and comfort during these years… I have a permanent lump in my throat and long for you to be here as it is an experience which few can have and which I would love to share with you” (Black Diamonds: The Rise and Fall of an English Dynasty)