If your relative is over the age of 16 and does not have capacity to make a particular decision, the law (Mental Capacity Act 2005) says that, a decision must be made in the person’s ‘best interests’. Your relative should be supported to input to the decision as much as possible. This template letter resource was produced by the Challenging Behaviour Foundation in partnership with Mencap, Ambitious about Autism and Irwin Mitchell Solicitors. The letters ask the decision maker to consult you and your relative in the decision making process and clearly set out the legal requirements to involve you both.