Did Cain marry his sister? Ken Ham rather strongly implies he did. I’m not aware of any such declaration in the Bible, and yet Ken Ham says it would be OK.
My question to Ken ham is whether it is OK to make up stuff that isn’t in the Bible and then lecture other people’s children about why it is OK.
Ken Ham gave a talk at our church once. If I recall correctly, he does believe that Adam and Eve’s kids had to marry each other. Who else would they marry, I suppose. The earliest humans lived hundreds of years and were more pure, not yet prone to genetic disorders, etc., so at first they were allowed to marry close relatives. The prohibitions against incest did not occur until later in the Bible. At least according to Ham. I disagree with a lot of what he teaches. I’m just reporting what I remember about that particular issue.