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.
Over one in ten of the children who contact ChildLine to report sexual abuse are of primary school age, according to figures released by the charity.
Childline said 11 percent of callers to their confidential hotline reporting sexual abuse, gave their age were 11 or younger.
NSPCC chief executive Peter Wanless says its new Talk PANTS campaign aims to give children the confidence to report abuse to a trusted adult.
He told Daybreak that many media stories about abuse were "the consequence of children feeling uncertain or unsure" about whether something had happened.
The NSPCC's 'Talk PANTS' campaign, launching today, is being supported by Netmums and complements the organisation's ChildLine Schools Service, which is visiting every primary school in the UK advising children how to stay safe from all forms of abuse.
Peter Wanless from the NSPCC said the campaign aimed to make children more aware of what abuse is so that they can identify it and prevent it, as well as enabling children to talk to their parents about the issue.
Parents are being urged to talk to their children about sex abuse in order to protect them from being victimised by potential predators.
The NSPCC has launched a new 'Talk PANTS' campaign aimed at encouraging parents to have open conversations with their children on the subject. NSPCC chief exec Peter Wanless said opening up the channels of communication was key for parents, and could "make a big difference."
The NSPCC has launched a campaign aimed at helping parents talk to their children about sex abuse, in a bid to protect children from sexual abuse. The campaign, called 'Talk PANTS' encourages parents to teach their child five simple rules:
- Privates are private
- Always remember your body belongs to you
- No means no
- Talk about secrets that upset you
- Speak up, someone can help
The NSPCC has launched a new campaign to help parents protect their children from sexual abuse. The campaign is aimed at helping parents talk to their children more to enable them to lower the risk of being victims of offending.
It comes as a YouGov poll shows that half the parents of 5-17-year-olds surveyed have never spoken to their sons or daughters about the issue.