User blog comment:Demileto/Is Lincoln Campbell really an alias for Thomas Ward?/@comment-18086040-20150525031944/@comment-26412466-20150901210531

There's a notable instance in the comics where the siblings' powers are very similar in nature: the Summers brothers, Cyclops and Havok (ok, and Vulcan, but he's relatively minor in Summers mythology). In fact, they're so similar that they cancel each other: Cyclops is immune to Havok's power and vice-versa.