Honey in no way are you to blame, these things happen, nothing we could have done would have stopped this happening.
I can understand the emotions that you and your family will be feeling its a bit like been on a roller coaster, so many ups and downs.
Its very hard but with the correct support you can get through this.
I did google WPW must be very scary for you and your family? How is Angel coping? Is she aware that she has a problem? Have they said if they will operate?
Alex has had his first surgery, he had his first op when he was 2 weeks old, he will need at least another 2 perhaps even 3 over the next 8 to 20 years.
The link at the bottom of my sig explains about Alex and his surgery.
Have you been put in touch with any support groups?
Jx