The Blue Lagoon

Two siblings, Richard and Emmeline, escape a shipwreck with Paddy Button and find themselves stranded on a deserted island with no food or water. Paddy teaches them survival skills, but he eventually dies after drinking rum. The siblings grow up, develop a home, and eventually face challenges as teenagers, including romantic feelings and a ship passing by without them signaling for help. After Emmeline is injured, Richard saves her and they realize their feelings for each other. They have a child and eventually, a ship led by Richard's father appears on the horizon, spotting the couple with their baby.