His father always forgot many things, which troubled his children. Once, a father forgot his birthday and the sons and daughters decided to celebrate a special birthday for their father. They found some cakes in their father's fridge, but when they were preparing gifts for him, they found that his father had forgotten his cell phone number. The sons decided to write a letter to their father to express their love and concern. In the letter, they told their father how much they loved him and reminded him not to forget his birthday. The daughters used their own strength to prepare a surprise for their father. They made a beautiful birthday cake for her and wrote happy birthday wishes on the cake. In the end, the father spent an unforgettable birthday under the care and love of his son and daughters. He realized that although he had a bad memory, his sons and daughters still cared about him and were willing to do anything for him. This experience moved the father even more and he decided to cherish his sons and daughters even more.