Havok is Cyclops' younger brother. Havok is also a mutant like his brother, his power allowing him to absorb energies of all types and convert it to plasma energy. Being's Cyclops little brother isn't easy. Havok has long been in Cyclops's shadow, despite also having led teams like X-Factor, the X-Men, and the Uncanny Avengers. Havok and Cyclops have also shared something more intimate — the love of Madelyne Pryor, Jean Grey's clone and the current ruler of Limbo. In modern X-Men comics, Havok has joined Madelyne as her consort.
Source：https://www.cbr.com/dark-xmen-havok-madelyne-pryor-limbo-mutant-x/
