Write down your sources of information. Who/what told you? This is documentation. From this, you will be able to find the source again, if you need to do so.
Lineage societies are societies that limit their membership to descendants of a particular person or group of people of historical importance.
Before ordering a book through Inter Library Loan (ILL), try searching for it using a Search Engine as well as in Google Books or at the FamilySearch website.