Michael Douglas and Catherine Zeta-Jones marked a very special family milestone over the weekend. The Hollywood couple celebrated their eldest son Dylan Douglas’s 26th birthday on August 8, sharing heartfelt tributes alongside a collection of never-before-seen family photographs that captured his journey from childhood to adulthood. The emotional posts offered fans a rare glimpse inside one of Hollywood’s most enduring families, with both proud parents reflecting on the close bond they share with their eldest child. © InstagramDylan as a young boy Catherine’s touching tribute Catherine, 56, was the first to honour her son, posting a carousel of treasured family photographs spanning his entire life. The collection included adorable childhood snaps, one showing a young Dylan cuddled beside his baby sister Carys, another of him nestled in his mother’s arms, as well as more recent portraits of the aspiring actor. © InstagramCatherine with Dylan “Happy birthday to my son Dylan!!!!!” the Wednesday star wrote. “You are everything to me and fill my life with joy. Have a wonderful year ahead, love, and thank you for all …