Create your story in one computer file. Do a page break where appropriate. If you have already created separate files for each chapter, pull your story into one computer file in the order represented by your hard copy manuscript. You can create a new file and copy and paste the chapters into it. Footnotes may be included.
End Notes are more common today, placed either at the end of a chapter or at the end of the book.
Simply place a superscript numeric next to the referenced item, and add the same numeric and the Note on a separate page at the end of your book. Your family book can look professional. And the steps that follow are practical ones that will either rob you of later opportunity, or they will add to the strong foundation of the book you have created. We will discuss a variety of ways to produce and design your book so that as you write, you do so with information necessary to accommodate later steps. Understand that having your book on a computer disk will gain you future options you have not yet considered.