Almost universally the split seems to be one 2e, one somewhere between highly and profoundly gifted (with the possible exception of my son's friends, one of whom is gifted and his brother ADHD-- mom declined to have Twin 2 tested for gifted because of the ADHD but I suspect he's up there somewhere).
With one of the triplet sets, all three sibs are 2e; the other set is 2e, 2e, and "plain old" gifted.
Oddly, all four of mine (fraternal girls, now adult, and fraternal b/g teens) scored within two standard deviations of one another, though youngest dd's WISC-R score includes a pretty hefty verbal suppression. She's my alphabet-soup-diagnosis kid.
