Please read Gen 4 and 5 and answer the question below about genealogies of Adam.

Genesis 4 and 5 give us two genealogies: One draws a quick sketch of the descendants of Cain; the other gives a detailed written account of Adam's line (literally, "This is the book of generations of Adam") through a third son Saeth.  These ate not comprehensive family trees listing every descendant.  The author is using a literary device called a toledot...."the generation of"......which serves to focus the reader on the story line.

Compare and contrast the two family lines.  why do you think the author focuses in on Seth's descendants rather than those of Cain in Adam's "official" genealogy?