There is nothing more terrifying and difficult for any parent to experience than to have their children ripped from them unjustly, without notice or due process. While some states seem to be genuflecting slightly towards understanding that terror in recent years, and some state-level laws have been enacted in sporadic jurisdictions giving parents "back" some of their Constitutional rights (to varying degrees,) there is no uniformity, and the horror has not stopped in may locales.
In fact, the problem remains so acute across the entire western world that a whole genre of literature has sprung up providing advice for affected families. This page displays some of the resource books that are available for distraught parents, starting with "Fighting CPS: Guilty Until Proven Innocent," by Deborah Frontiera:
https://www.amazon.com/Fighting-CPS-Innocent-Protective-Services/dp/0980006163
This particular book highlights the 13-month struggle endured by a family very close to the author and also the author's own family, and how they were finally able to get some relief. The book is more of a call to action than a step-by-step process guide, however. It still is a must read for families caught up in similar circumstances.
Others of the same genre include:
"Legally Kidnapped: The Case Against Child Protective Services," by Carlos Morales
"The Secret: How to Fight Child Protective Services and Win," by Vincent W. Davis
"Child Protection/Abduction Services: The Modern Mafia: Federally Financed Perjury," by Dr. Eric Keefer, D.D.
" The Worst Interests of the Child: The Trafficking of Children and Parents Through U.S. Family Courts," by Keith Harmon Snow
"A Culture of Fear: An Inside Look at Los Angeles County's Department of Children & Family Services," by Julian J. Dominguez
There are many other such books available, and many of these are very inexpensive downloads, as the authors seem truly more interested in helping families than they do in making a fast buck.
Of course, nothing can replace the advice and assistance of a good lawyer known to be competent, familiar with the myriad complexities of dealing with C.P.S. seizures, and with the knowledge base needed to effectively combat C.P.S. overreach.
For those living in the U.K. there is a group parents in need should at least look into. The link can be found here:
http://www.frg.org.uk/images/Advice_Sheets/4-family-support-services.pdf
Pages 28-30 specifically offer some advice as to what can be done if you are opposed to the U.K. government's decision to "accommodate" your child.
In the U.S.A., a group called "Texas Law Help" seems to be one group that is pretty well organized and capable of fighting unwarranted seizures. They can also provide advice to parents in other states, at least how to get local legal assistance:
https://texaslawhelp.org/toolkit/i-want-help-and-information-dealing-with-child-protective-services
Sadly, such resources are far and few between, and parents definitely need to be careful when contracting for legal help, because oftentimes lawyers may misrepresent what their true interests are, and may actually not be as sympathetic to families or as independent from C.P.S. or other government agencies as they may first appear. Reading on-line reviews, asking for references of other families "they've helped," previously should always be part of the process before retaining a specif lawyer or firm.
Oftentimes, the best advice is to NOT allow anyone into you home without a warrant. Many times the first mistake is the fatal one when dealing with over-zealous C.P.S. staff. Never allow C.P.S. to interview anyone in your family without legal representation if there is no warrant.
Of course, you must be polite but firm if the C.P.S. worker shows up with law enforcement but no warrant. Be sure to let them know, POLITELY, through both your speech and action that you know your rights and that you are willing to protect them. VIDEO RECORD THE EXCHANGE IF AT ALL POSSIBLE, or at least get the audio of it.
Of course, all of this is assuming you are not guilty of "abuse" beyond standard and legally acceptable corporal punishment, and the standards for that can vary from state to state as well. There is no substitute for knowledge, and these days, all parents need to take the time and effort to arm themselves with knowledge, as it is often much more difficult (and sad) to have to do so after your children have been unjustly removed.