The NSPCC report has revealed that calls about child neglect have doubled in the past two years, and are up by a third in the last year alone.
The charity warned the sharp increase is placing additional pressure on already stretched children's services, with more children being taken into care and families being affected by cuts.
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Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Two brothers have been arrested on suspicion of murder after their parents were found dead in their own home over the weekend.
The first man to be convicted of murder on the basis of DNA evidence should be moved to an open prison, according to the Parole Board.