Thank you for your support, I'm glad you were able to catch yours very early as that is truly the key. Surprisingly we have yet to find the primary location where it started. Which most likely means his body fought that location off already, this gives him a bit of a better chance but it also means we weren't able to find it early enough.
I have already have one melanoma but luckily they found it very early on. I have more than a thousand moles though so I am constantly being checked.
Lets hope your dad will survive. It is possible even at stage 4.