Is it permissible for government employees to engage in freelance work using the names of their sons, daughters, or wives, knowing that the state does not allow them to do so?

It is permissible for a government employee to engage in freelance work under two conditions: that such work does not interfere with their official duties, and that they are not prohibited from engaging in it. If one of these conditions is not met, then it is not permissible for them to do so. If the state does not permit it, then it is not permissible for them.