This report presents a detailed analysis of a criminal law case involving Harry, a 10-year-old boy, convicted of murdering his mother, Pat. The case delves into the application of criminal law principles, particularly focusing on the defenses of diminished responsibility and loss of control. Harry, diagnosed with ADHD, set fire to his mother's bedroom, leading to her death. The report examines the elements of murder, including actus reus and mens rea, and explores how Harry's mental condition and actions relate to these elements. It analyzes the potential applicability of diminished responsibility under the Homicide Act 1957, considering the impact of his ADHD and the role of intoxication. Furthermore, the report discusses the defense of loss of control introduced by the Coroners and Justice Act, assessing whether Harry's actions could be attributed to a qualifying trigger. The analysis includes relevant case law, such as R v Byrne, R v Tandy, and R v Gittens, to support the arguments for Harry's defense in the appellate court. The report also assesses the causation of Pat's death considering her pre-existing breast cancer and the head injury sustained after jumping from the window. The report concludes with an argument for Harry's appeal, focusing on the legal implications of his mental state and the circumstances surrounding his mother's death.