None of them proved able to learn the alphabet beyond the letter B. They accepted everything that they were told about the Rebellion and the principles of Animalism, especially from Clover, for whom they had an almost filial respect; but it was doubtful whether they understood very much of it.
There are no more uses of "filial" in the book.
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tried to restrain her mother, so far as filial respect would allow
An F1 hybrid is the first filial generation of seeds/plants or animal offspring resulting from a cross mating of distinctly different parental types.