While the way she discovered her links to a war criminal was by way of a random, pretty startling coincidence, this book and 'story' otherwise add absolutely no value to these terrible historical events.
Ms Teegue certainly had relations who did inhumane, diabolical things, however she herself had nothing to do with those acts and therefore, no 'story' to tell that is not already documented.
In sum; she claims 'this is a story that needed to be told.' It didn't. She could have just privately acknowledged and grieved what her relatives did, and moved on with her life. Instead she's now capitalised on it with a pointless book.