Catherine Zeta-Jones and Michael Douglas' son Dylan has shared the sweetest message about his family life.MORE: Catherine Zeta-Jones looks sensational in purple swimsuit as she swims in the seaThe 21-year-old took to Instagram to pay tribute to his older brother Cameron Douglas on his birthday, alongside a note he had written on his phone.It read: "Cam – you are an amazing soul, so kind and insightful.