It's perfectly fine by me if you go and call him Scar, I don't mind! Though if he's more of an Ed then calling him Scar is just an insult to Scar. ;)
You don't really mention them much. Not that I mind, we're more about the fun when we're together in one place, but you know you can talk about them anytime, yeah? I'm not good at emotions or parents but I'm a good listener.