Please remember me to your family 请代我问候你的家人；请替我向你的家人问好；请代我向你家人问好

【例句】
Please remember me to your family when you return to the United States.
回到美国后，请代我向你家人问好。

With best wishes. And please remember me to your family.
谨致以良好的祝愿，并代我问候你全家人好。