Is this a good synopsis?

It sounds pretty good, although I'm not going to question why you need a synopsis if you're just going to give them the book. The third paragraph reads far less smoothly than the first two, especially when you start mixing past perfect and present progressive. Perhaps you could say something along the lines of, "I know, objectively, that these actions are eroding the bind that holds my family together." That seems more clear to me, but it's a matter of stylistic opinion.