Also, I think the idea of one sibling teaching the other is a little flawed. Firstly, there's a massive difference between being able to learn and being able to teach - the non-educated sibling would get a significantly lower standard of education. More importantly, even if they did somehow get the same standard of education, they wouldn't have the official qualifications that the educated sibling would have, so they would still be considerably worse off, as that is what counts far more than the actual knowledge.
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