Satyesu, I don't know if there's any software. I had a problem in that we moved around so much, I wasn't sure where or when things happened. I finally started a separate file, and under each year listed my siblings' ages and our grade in school. From that, I was able to fit in proper sequences of events--just short, one-line notes. That served as a rough table of contents as I worked my way through the chapters. That list helped later, too, when I researched events, interviewed people, and looked at what was taking place in the world at large during any specific period of time.
Using the years as a reference may not help you, but if you can make a similar list, based on the structure of your book, I think you might find it helpful. If nothing else, it was a method for me to look at what I wanted to include, get those things into the right place, and not inadvertently repeat them somewhere else.
Best of luck!
