@Sietz this book and breaking apart distorted cognitions will help with Radical Acceptance. Give it a whirl! :)
@FauxLiz This thread is about David Burns' book called "Feeling Good" It has a particular few pages on suicide. It might be useful for you at this difficult time.
@CoalStars have a look at what this book encompasses, it might assist with your family member. Cognitive distortions can lead to suicidal ideation. David Burns writes about suicidal ideation really well.