A man who made a farewell video of his two children before strangling them with computer cables was convicted of their murder on Tuesday and jailed for 28 years. Petros Williams,37,killed his four-year-old daughter and two-year-old son last October after the breakdown of his marriage to their mother. Williams recorded a video,addressed to his wife,in which he could be heard asking the children to say: We love you mummy and we will miss you,before telling them to say bye. Williams had discovered his wife had started using dating websites to see other men.