Reference for Sanhedrin 55:27

מאי טעמא דרב דאמר קרא לא יומתו אבות על בנים ובנים לרבות דור אחר

nor may I, my son nor my son-in-lawtestify for him. But why so? Does not this involve relationships of the thirdand the first degrees?<span class="x" onmousemove="('comment',' Rab's son is a grand-nephew' of Rab's uncle; hence, Rab's son is a relative of the third degree to Rab's uncle, who is of the first degree in relation to Rab's father. (N.B. 'First,' 'Second', and 'Third' almost correspond to generations, but not quite, since a father vis a vis his son ranks as first to first.) ');">²⁵</span>

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