Ok but what then was meant by the description that Noah was pure in his generations? Whatever the criteria was used in describing Noah's generations as being pure, wouldn't that criteria also apply to his immediate family?
Otherwise shouldn't there be a curious passage somewhere in scripture alluding to some issue with Noah's wife and/or daughter in-laws?
Yes, Nephilim/giants were recorded before and after but if the nephilim/giant bloodline was a reason for the flood, why would God preserve such corrupt bloodline in the form of Noah's wife and or one or more of his daughter-in-laws?
Furthermore, if Noah's wife was of corrupted bloodline, so too is all of humanity.
If it was one or more daughter-in-laws having corrupted bloodline, then 30% to 100% of humanity is corrupted. If Ham's wife and/or JAphet's wife had corrupted bloodline wouldn't God have warned Noah that the children of Shem should have nothing to do with the children of Japhet or Ham? Yet, no such warning exists.
Yes, Noah did curse Canaan but that was about an entirely different matter and Canaan was only one of Ham's many children.
You seem very intent on finding things that are "pure" or "corrupt" in "bloodlines".
I'm not reading anything like that in Genesis 6 when it talks about Noah being blameless among his generation. Here's Genesis 6:9 from the Amplified version (which does some of the translation more accurately, even if it sometimes is terse):
Genesis 6:9 (AMP) -- These are the records of the generations (family history) of Noah. Noah was a righteous man [one who was just and had right standing with God], blameless in his [evil] generation; Noah walked (lived) [in habitual fellowship] with God.
Note that the square brackets [] are the translators' way of saying they're not sure exactly how to translate it. Also take note of the two words "generations" and "generation". In the underlying Hebrew, they are two different words with different meanings.
The "generations" in "these are the records of the generations" of Noah comes from the Hebrew word tôlḏôṯ, which means descendants. While the word "generation" later in "blameless in his generation" comes from the Hebrew word dôr, which means Noah's age group, or his area (kind of like we'd say "my generation" today). Put that altogether, and Genesis 6:9 says it's going to begin talking about Noah's descendants, and by the way Noah was blameless in his otherwise sinful generation.
Any talk about Noah having some pure bloodline or some such is hogwash. It's all about righteousness and God knowing who would repent and who wouldn't, who God wanted to teach a righteous culture.