How do you prevent daryll from killing your wife on starry night harvest moon ds?

To prevent Daryll from killing your wife in "Harvest Moon: DS - Cute," you need to keep your relationship with your wife strong and maintain a high heart level. Make sure to regularly give her gifts, complete events, and participate in activities together. Additionally, avoid letting Daryll get too close to her; if he starts to express feelings, focus on enhancing your own relationship to deter him. If all else fails, keeping an eye on events and ensuring your wife is safe during critical times can help mitigate any threats.