Buy land. Build a structure to be the family library. A small study/shelving shack. Write a book that you want your decendants to read. Make it a family requirement for everyone to at least publish one book into the family library. Anyone from your bloodline can enter and read first hand accounts of their ancestors ideals and experiences. The only bias in your set of family books is that they have your best interest at heart. None of my relatives did this for me. My grandfather is a little bitch and the more I was told about his father the more I felt connected to my great-grandfather. If he left a book behind i would have had a way to bond with the dead and get to know him better. Instead he's practically a stranger I only heard a few negative stories from by his ungrateful son. Over the generations they can expand and build the library into something great as they continue to contribute. No matter how much time passes, your decendents will be eternally grateful that you were the one who started it for them. They'll never feel lonely when they have generations of their ancestors passing down knowledge and sharing family tales one page flip away.