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Without a doubt, the wife of Cain was one of his sister!!!!!
The Bible is a spiritual book not a historical one.
The thing I am most curious to know that is not mentioned in the Bible is actually Christ's childhood. We are given a few stories specifically designed to teach us something. However outside of the day of His circumcision, the time He went to the temple when He was 12, and the wedding of Canaa of Galilee (not really childhood, but pre-missionary or before He was 30 years old), we do not know much about His life. Church tradition tells us that He was a humble carpenter, but more than that there is very little that we do know.