They seem to be commonly quoted, without sources. I found this "Approximately 70% of second-generation family firm successors are likely to close the family f

They seem to be commonly quoted, without sources. I found this "Approximately 70% of second-generation family firm successors are likely to close the family firm post succession due to succession process-related issues" in an abstract of a paper https://scholarworks.waldenu.edu/dissertations/10669/ https://scholarworks.waldenu.edu/dissertations/10669/ But nothing close to confirming the claim