Right after my diagnosis I told my immediate family (wife, children, brother, sister) by way of explaining 35 years of bad behavior. My parents are deceased, so I didn't have to deal with that. I also told a couple of close friends who I could trust not to pass it along.

My doctor told me I should tell at least one trusted co-worker. He said that if I had an episode at work and I didn't realize it, my co-worker could let me know that I needed to go home.

So far all of that has worked for me. YMMV.