Here is an interesting story about the influnce of maternal grandmothers on the success of their grandchildren. http://query.nytimes.com/gst/fullpage.html?res=9905E0DF123EF936A35752C1A9649C8B63 This story was voted one of the best science stories of 2003.
It would be interesting for people in Geni to denote grandmothers that participated in the next generation's upbringing. Then have the data correlated across all GENI without identity tracing.
Regardless, it is a good read.