OK, when I was answering this question ("How to explain the ages of Valentine and Peter in Ender's game"), I posted a quote that now doesn't seem to make any sense to me:
He took one of the children along, an eleven-year-old boy named Abra; he had been only three when the colony was founded, and he remembered no other world than this. ("Ender's Game", Ch 15).
Now, as I have noted in the quotes in the answer, the colony was started 50 years before Ender got there, by the pilots who were fighting the buggers.
So, how could Abra be 11 years old 50+8=58 years after the colony was founded, but 3 years old when it was founded in the same sentence?
(the obvious guess would have been that he was one of the colonists sent with Ender, but I distinctly recall Card mentioning that he was NOT that and was born on the colony world somewhere else).