"Dear Mark,

Just a quick note to say thank you for everything you have done for my son and family. We certainly could not have survived this whole ordeal without your support and guidance.

I know that you took a great deal of time away from your family to think about mine and I truly appreciate that. This even has changed our lives forever and I do hope that we all can look back on these many months of stress and anxiety and find some reason for good. Hopefully someone somewhere benefits from what we went through.

I am blessed to have met you and thankful that you were there when we needed you the most.