MPs today will vote on the Children and Families Bill. If it passes, Clause 20 will make Review of Sex and Relationship Education a statutory part of the National Curriculum.
Shadow Children's Minister, Lisa Nandy, has told ITV Daybreak: "It's really important [that young children] understand what a healthy relationship looks like."
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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.