You’ve phrased your purpose a little more like a “what” than a “why”, but I think your purpose is in there:
Help people (and their loved ones) who have received a life-altering medical diagnosis to cope with uncertainty, and with the changes to their life and world view.
When writing your blog posts, you may stumble over whether you’re writing for the person who has received the diagnosis or their loved ones. Ellen hasn’t received a diagnosis, but her brother has. If you write for Ellen, then it doesn’t mean her brother wouldn’t want to read your blog. He’d also benefit from it.
But when you sometimes speak directly to Ellen and sometimes to her brother, you might get yourself in a muddle. Would you rather write for Ellen or her brother?
Good work this week. You might have introduced yourself a couple of weeks as “blogless Mary”, but at this rate, you’ll have your blog up and running soon!
Enchant readers. Woo customers. Win business.