To distinguish the generations and facilitate communication, the fourth generation is generically known as ""The Cousins"" (24 in all, with 21 still living) and the younger family members are known as the ""Fifth/Sixth"" generation. Many if not all of these family members are involved in institutionalized philanthropic pursuits. Family links are solidified through the practice of ritualized family meetings - which started with the regular "brothers' meetings" held in Room 5600 or in their respective private residences, beginning in 1945. Family get-togethers are held today at the ""Playhouse"", in the Westchester County family estate of "Pocantico", in June (the "cousins weekend") and December of each year (see Kykuit).