I'm going to put a 3 on my parents and siblings, well, my brother at least, my sister less so, probably a 5. My closest friends at a 3 and my other mates at around a 5.
The reason being that with family and my closest friends, I've had an open and frank discussion with them about how I feel, that opting for an exit of my own volition is definitely an option for me, always will, and that I'd sooner talk to them about it, rather than do something unexpectedly out of the blue. My mum said something which sticks with me. She basically said that if they get a call from a number they don't recognise, or they call me and I'm not answering and so on, that they do often expect it to be that I've taken the exit. Not just me, either, they tend to think of the same about my brother, as he has been in a bad way for quite a long time - due to his own reasons, different to my own.
Their sentiment was that, they wouldn't want me to take that option, but at the same time they wouldn't want me to lead a miserable existence. They've been brilliant, throughout my life, so I felt duty bound to be open and honest with them about my feelings, if for no other reason that I would never want them to blame themselves - assuming my own end came before theirs. It's not their fault in the least that I feel the way I feel, and I'd be gutted for them to believe otherwise.
Close friends, same score as above.
Everyone else? I think they know I'm prone to being suicidal, they definitely know I have my struggles, although I think they will be a bit more surprised; "I can't believe he actually did it" that kind of thing.