Final answer:
In ancient legal systems, the father was allowed to kill his daughter and her adulterer to protect the family's honor and future well-being of the children. The father had to kill both simultaneously and without delay.
Step-by-step explanation:
In certain ancient legal systems, such as the Roman and Persian laws, the father was allowed to kill his daughter and her adulterer. Although it may seem extreme, the rationale behind this was to protect the family's honor and the future well-being of the children. The father had to kill both the daughter and her lover simultaneously and without delay, as a sign of equal resentment towards both parties involved.