Hi a warm welcome to the site.
Your setting will have a policy to deal with complaints that provides guidance so you can write about handling one. Can you ask them for a copy of it?
Allegation, accusations, suspicion of abuse or inappropriate behaviour made against a practitioner will also be dealt with legally through the settings safeguarding policies and procedures.
This quote is from page
92 of this level 3 Early Years Education handbook
Allegations made against staff
Schools and early years settings are usually some of the safest places for children to be. However, sadly there have been incidents where children have been harmed or abused by the adults who work with them and care for them.
Page 100 then goes on to examine whistleblowing.
This is from the older CYPW handbook page 45
Know how to respond to complaints
Inevitably when a potentially difficult dilemma, such as that of balancing duty of care and individual rights, is concerned, practitioners will sometimes find themselves in a position where parents feel that the duty of care for their children has not been given sufficient priority, or the children's rights have been wrongly perceived.
Responding to complaints
Complaints should never be ignore. Parents have responsibilities to ensure their children's welfare and to complain if they feel that a setting is not exercising sufficient duty of care.
Complaints procedure
As with many aspects of a setting's practice, complaints should be handled in a ways which are guided by a pre-planned procedure, to ensure that families's rights are properly supported while also protecting practitioners by providing them with appropriate guidance.
You'll find examples of complaint procedures on
google
Hth, best wishes