Gillian Hearst
Patricia's eldest daughter, and Lydia's sister, Gillian Hearst, is a stylish philanthropist and writer. The glamorous New Yorker is a contributing editor to Town & Country magazine (published by the Hearst Corporation, natch) and a mother of three.
She's a chair of the MSK Associates committee and Good+ Friends, and can frequently be found at well-to-do fundraising events around town.