Final answer:
The exact punishment for marrying a step-sister varies by historical context and legal code, with ancient laws ranging from financial penalties to death for different offenses. However, the punishment listed in the question is not specified within the examples provided, as ancient laws from Mesopotamia, Rome, and others feature diverse and complex consequences for personal and social violations.
Step-by-step explanation:
The punishment for a person marrying his step-sister and other laws relating to personal and social conduct can be found in various ancient legal codes, such as those from Mesopotamia, ancient Rome, and other early civilizations. However, the specific punishment mentioned in the question does not directly correspond to the laws from any of these ancient cultures that have been referenced. For instance, in some ancient Near Eastern laws, punishments were quite severe, including the mutilation of limbs and even death for various offenses, such as a son striking his father or a crime committed by one member affecting their entire family.
Furthermore, social distinctions played a significant role in the severity and type of punishment; a noble might incur a different penalty than a commoner for the same offense. Roman and other ancient laws regulated aspects of marriage, divorce, and adultery, with consequences including financial penalties, exile, or death in certain circumstances.
Given the lack of a specific reference in the provided information, the exact punishment for a person marrying his step-sister according to the context of historical laws and customs cannot be determined without more details on which legal code or cultural norms are being referred to in the question.