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Sue Berelowitz, the deputy Children's Commissioner, said that Britain needed to "get to the bottom" of child abuse as the commission embarks on the new inquiry.
"We need to stop the abuse and work very hard to do that, so for all kinds of reasons we have got to get to the bottom of what's going on," she told Good Morning Britain.
The Children's Commissioner has said the public will be shocked at both the scale of family child sex abuse and the way in which victims are treated.
Dame Maggie Atkinson has ordered a two-year national review of chid sex abuse within family environments, including arising from forced marriages.
"Society is rightly horrified by child sexual abuse," Dame Maggie said.
"Most of our children are raised in secure, loving homes but I am sure very many of us will be disturbed by how much abuse within the family environment goes unreported and how little is done to support the children who suffer," she added.
The Children's Commissioner is launching a new two-year nationwide inquiry into child sex abuse in families.
The inquiry will particularly look at the issue of forced marriage, since this is thought to often lead to abuse.
Among the questions examined will be how widespread the problem is, how to support victims and how to prevent abuse.