LSH: Karate Kid and XS

Karate Kid (who predated the 80's flick version by some 15 years or more) is a 30th-century master of every known martial art, many non-terrestrial in origin. He can tangle with Superman-level opponents and live to tell the tale...without throwing a single freakin' fireball.<br />
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XS is a much more recent addition to the LSH mythos. She's the granddaughter of Barry Allen, the Flash of the 20th-century. But how is this possible, you ask, since this dark-skinned cutie was born 1000 years after his time -- and looks nothing like her blond-haired gramps? Well, Allen travelled to the 30th century with his wife, and they had a pair of twins before they ended up back in the 20th century. Those "Tornado Twins" went on to have kids of their own in the 30th century. XS was the child of the female twin.<br />
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There, clear as mud, right?