^ btw, if you are on the fence and trying to convince yourself that it won't be *that* devestating, that's a terrible thread to peruse, lol
for me i know my parents would be devastated, and the fact they pretty much resent each other these days is one less protective factor. they do have fairly good support networks of friends and family and know how to access counseling/group therapy so that's something, and they also have another child - though in a way i imagine my sibling's life would be majorly disrupted in that he would most likely feel obligated to put his own life on hold to be with my parents.
as for how he would react, although i imagine a sibling's grief is wholly different from that of a parent, i still imagine he would experience a fair amount of guilt on top of general sadness that he will never see me or speak to me again. we don't always see things the same way, and if we weren't siblings we likely wouldn't be friends, but we're still fairly close and roughly the same age so we have a lot of history together.
in the end (and this is mostly speaking about my parents), i know grief is inevitable, and that no one truly gets over it like someone here said, and so IF i do ctb (big if), that's just something i have to accept; my hope is that eventually they'd be able to resume their life. especially because if i were to die in a tragic accident (which would be out of my control), they would still grieve y'know? i also hope that because they know about my struggles (so, it wouldn't be completely out of the blue) and i'm an adult (so they don't feel as responsible for me in the same way as if i were a child) that grief would be mitigated, and especially if they accept my pain was just too intense to bear. mostly though, if they were never truly able to enjoy life ever again, i could not forgive myself for that.