Stay calm: don't panic or get emotional. This may make your family feel more uneasy and nervous.
Know the situation: First of all, you should know what happened and why as soon as possible. You can consult a local lawyer for professional legal advice.
Contact the police: contact the local police to explain the family's situation and requirements. They will provide information about the progress of the incident and possible solutions.
Seek help: If you need other help, such as psychological support and legal aid, you can consider seeking help from relevant institutions.
In short, if your family is taken away and detained by the police, you should take action as soon as possible, get in touch with the local police, understand the situation and ask for help.