As to his remark about his deserts, it was also not unnatural if you consider that he stood beside the dead body of his father, and that there is no doubt that he had that very day so far forgotten his filial duty as to bandy words with him, and even, according to the little girl whose evidence is so important, to raise his hand as if to strike him.
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.