Greetings!

I truly understand your concern regarding the need for quarantine since your husband who just returned from Japan is under self-quarantine. To answer your question, the whole family do not need to be quarantined. They still need to practice proper preventive measures, nevertheless. According to a guideline for home quarantine published by Centre for Disease Control and Prevention (CDC):

• Your husband should be in a room by himself and avoid contact as much as possible from the rest of the household members.
• He should also have an access to a bathroom for his own use only. Monitor your husband for development of any symptoms.
• Prohibit unnecessary visits by people not living in your house.
• Avoid contact with pets
• Make sure that shared spaces has good ventilation
• Maintain good hygiene like washing hands frequently and avoid touching eyes, mouth, nose with unwashed hands
• Wear face mask when you are in the same room with your husband. Do not reuse the face mask.
• Avoid sharing household items with your husband, wash his clothes separately and thoroughly.
• Wipe surfaces with disinfectants.
• Dispose all face mask, disposable gloves and other contaminated items in a lined container before disposing them with other household waste.

To monitor the risk for your husband or other family members, you may answer this brief quiz (Evaluate Your Corononavirus Risk). You can also monitor for development of symptoms like:

• Fever more than 37.5 degrees celcius.
• Coughing
• Shortness of breath

Thank you for your question.