Book: The ADHD Effect on Marriage

I recently purchased the book - The ADHD Effect on Marriage. I have been married for 24 years and I believe my wife has ADHD. She does admit she probably has ADHD, but refuses to seek any help. Our 16 year old son has been recently diagnosed with ADHD and is currently taking medication for this. I have seen a big improvement in him, when he is on his ADHD medication. My wife shows many of the same symptoms as my son, but like I said before, refuses to seek help. I have spent countless hours researching ADHD and I am about at the end of my rope. This is why I decided to purchase this book. My Question is: Before I start reading , should I let my wife know, that I am reading this book, or be secretive about it? Should I suggest that she read the book first? Any suggestions would help. The strain and stress of the marriage is becoming too much for me to handle.