My next questions were then how do you arrange a project for the intended audience (context and information is important as random photos of people 100 years from now won't have much value). And then how do you create it so the paper book lasts for 100 + years.
Your idea on Blurb was was interesting to me. Do you know the quality of the paper of the book will survive a long time or did you look into that? Also what reasons did you settle on Blurb (if you don't mind me asking)?
Thanks for pointing me in the right direction - I was about to suggest printing out individual copies and putting them in classic photograph book with plastic covers and adding her own blurbs.