Advice for parents about online grooming and how to deal with it is available from the following websites:-
Internet Matters
https://www.internetmatters.org/issues/online-grooming/
Childnet
http://www.childnet.com/parents-and-carers/hot-topics/online-grooming
NSPCC
https://www.nspcc.org.uk/preventing-abuse/child-abuse-and-neglect/online-abuse/
https://www.nspcc.org.uk/preventing-abuse/child-abuse-and-neglect/online-abuse/signs-symptoms-effects/