Family memorabilia to look for (and photograph if you do not have permission from the owner to take the item) include old pictures, military records, diplomas and report cards, and of course diaries, postcards, and letters.
Smolenyak suggests focusing your hunt in the attic, basement, and drawers where photos, documents, and personal correspondence may be stored. Items with dates are especially helpful. Family memorabilia to look for (and photograph if you do not have permission from the owner to take the item) include old pictures, military records, diplomas and report cards, and of course diaries, postcards, and letters.