Just looking at a few examples from government guidance on the law, you can see that keeping the family involved is central. Keeping secrets from families and making major decisions that will affect children's health and development is contrary to this.
"A child-centred approach to safeguarding
10.This child centred approach is fundamental to safeguarding and promoting the welfare of every child. A child centred approach means keeping the child in focus when making decisions about their lives and working in partnership with them and their families.
11.All practitioners should follow the principles of the Children Acts 1989 and 2004 -that state that the welfare of children is paramount and that they are best looked after within their families, with their parents playing a full part in their lives, unless compulsory intervention in family life is necessary."
(Working Together To Safeguard Children, page 8)
"14.Anyone working with children should see and speak to the child; listen to what they say; take their views seriously; and work with them and their families collaboratively when deciding how to support their needs." (page 9)
Statutory requirements for children in need:
"...local authorities undertake assessments of the needs of individual children and must give due regard to a child’s age and understanding when determining what, if any, services to provide. Every assessment must be informed by the views of the child as well as the family, and a child’s wishes and feelings must be sought regarding the provision of services to be delivered. "
assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/779401/Working_Together_to_Safeguard-Children.pdf