Parental encouragement is an important part of raising children. It involves providing positive reinforcement and support to help children develop into successful adults. Eating is an important part of this process, as it provides the necessary nutrients for growth and development. The three-letter solution to the crossword clue 'EAT' is 'DIN, ' which is a reference to the family dinner table, where parents can provide encouragement and guidance while their children EAT.