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Evolutionary psychology provides insight into family dynamics by highlighting mechanisms like kin selection and parental investment theory. Kin selection explains the altruistic behavior towards family members, suggesting that individuals are more likely to risk their lives to save their children due to the shared genetic material. This instinct is reflected in the observation that parental involvement significantly influences the timing of a daughter's first menstrual cycle, as girls with absent fathers tend to reach menarche earlier. Such findings indicate that biologically intact families promote healthier and more stable environments for children, emphasizing the evolutionary advantage of strong family units.