You do not have to speak with a Government Agent or allow them to enter your home without a search warrant!
When a government agent (social worker, police officer, etc) comes to your door, they are seeking your consent to allow them into your home. Remain calm. Say something like:
I understand your concerns and I'm happy to cooperate. May I see your search warrant please?
The agent may try to tell you that a search warrant isn't required because you can give voluntary consent or he may try to make you believe you are required to allow him into your home. The agent might say, I'm required by law to come into your home to investigate." It is true that the agent is required to make an investigation which may include entering your home. However, this doesn't give the agent authority to break the law. If the agent needs to enter your home as part of his investigation, he needs to obtain a search warrant.
Remember that the agent is the one asking you to circumvent the law. You are acting within the law and he is asking you to ignore the law, skip procedure and just do things his way.
Don't be intimidated. Keep a proper perspective of the situation; you are willing to cooperate within the law. The law dictates that a search warrant is required before entering a private home. Your position should be:
Do not allow the agent to peer inside of your home or view your children. Do not answer any questions without seeing the search warrant and verifying it's authenticity. Even minor questions such as your date of birth, name, number of children, etc. should not be answered without seeing a search warrant.
I do want to cooperate.
I do not want to ignore proper procedure.
Why would you want to circumvent clearly established laws and procedures?