This book was not really about Rosanna's Boys, as the title suggests. Each of the older three boys got one chapter in the beginning, and a paragraph or two at the end. The rest of the book is more a series of essays than a cohesive story. The beginning overlaps the first book (which you do not need to read to enjoy this one); it goes over weddings, church services, what the Amish believe, and so forth, some of it more fleshed out than the other book, and some of it new material. Most of the second half is Joseph's account of going to school, teaching, and the like. Along the way are thrown in a handful of stories of things that either happened to him, to people he knew, or are commonly told among the Amish in his area.
The customs described are from the turn of the (last) century, and some of them no longer apply to today's Amish.