Did Cain marry his sister?

Could you please clarify the context of this question? Are you referring to the biblical story of Cain and Abel, where Cain kills Abel out of jealousy? If so, the traditional interpretation of the Bible does not explicitly state that Cain married his sister. However, some interpretations and theories have suggested that, given the limited population at the time and the cultural norms of the time, it is possible that Cain may have married a close relative, including a sister. But it's important to note that this is not a definitive answer and is subject to debate among scholars and theologians. So, in essence, the question "Did Cain marry his sister?" does not have a clear-cut answer based solely on the biblical text.