Don't talk to his family. Period. Leave it alone for now. If they ask you, avoid it. Say "This is something I hope I can talk to you about in the future but I just can't right now. I hope you understand."
Can WAS be friends with their OP's they had EA's with?
I wouldn't recommend it. But that doesn't mean that people involved couldn't be mature enough to handle such. I just still wouldn't recommend it.
Would you be comfortable if they were still friends?