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It's when siblings are enemies instead of just rivals., so the former, though I don't think it's necessarily good vs evil.
Examples fitting your latter definition would go under Sibling Murder.
Edited by supergod For we shall slay evil with logic...
The playing with page talk about sibling murder however, and the laconic is vague about what "deadly" means.
Edited by LegitimateIdiot This account is dead. I’ve said a lot of dumb things in the past and I wish to forget them. I’m sorry if I’ve ever hurt anyone.
"Deadly" just means that their interactions are more violent than they would be in a regular Sibling Rivalry.
As for the Playing With page, it looks like the person who wrote that misunderstood the trope. That page for created in 2015, while the trope's had the same meaning it does now since it was created in 2007
.
The meaning of this trope is "one sibling is evil and the other is good", right? Or was it originally intended to be "the evil sibling kills the good sibling"? Because I'm seeing more of the former than the latter on the page.