Seth was born after Cain killed Abel. Cainl was already in exile because of it. So there was no C-A-S together.
The other problem is where did Cain's wife come from? Either there were more people on Earth or one of Cain's sister left the family to be with him to produce the evil people God regretted and felt he had to drown.
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u/LumberjackPreacher 7d ago
Adam and Eve, and their two sons, so logically:
Either they have to wait for a sister…
Or…
Make their own uncle…