Transform this uploaded photo (photo description: pop close with granddaughter and grandson with smiles on their faces] into a whimsical children's colouring book page. Convert it to a clean, high-contrast black-and-white line art illustration in a simple, cartoonish style suitable for kids aged 1-5 years. Use thick, bold outlines with minimal fine details to make it easy to colour—no shading, textures, or gradients. Emphasize joyful play elements like smiling faces, playful poses, and fun toys, keeping everything large and recognizable. Add subtle, optional doodle-like flourishes around the edges like stars or hearts to spark imagination, but keep the focus on the main scene. Ensure the overall vibe is happy, nostalgic, and family-oriented, evoking warm memories of aunty-niece-nephew adventures. Output as a single printable page with ample white space for crayons.