Build an AI bedtime story generator web app for families with these features:

1. Child profiles: name, age (2 to 8), favorite things (animals, toys, foods), a stuffed animal or pet sidekick, and optional siblings or friends to include. Multiple profiles per family account.

2. Story setup: choose a theme (space adventure, forest friends, ocean, dinosaur day) and optionally a gentle lesson (sharing, trying new foods, being brave at bedtime, starting school, being kind). Set length (3, 5, or 8 minutes) and silliness level (calm and sleepy to giggly). For wind-down purposes, the default tone is soothing with a slow, sleepy ending.

3. AI story writing: generate age-tuned language with the child and their favorites woven in naturally. Reading level automatically matches the age profile. Stories always end calmly to help kids fall asleep. Include the child's name throughout at a natural frequency, not every sentence.

4. Illustrations: optionally generate one soft, warm storybook-style image per page (no scary imagery, friendly faces). Styles: watercolor, crayon, cozy felt. Parents can skip illustrations for faster generation.

5. Read-aloud mode: TTS narration with a warm, slow storyteller voice, gentle page-turn pacing, and auto-dim background as the story progresses. Word highlighting for early readers.

6. Story library: save favorites for rereading, organize by child, and mark beloved stories. Series option: continue last night's adventure with consistent characters.

7. Safety layer: hard content filters (no scary, violent, or sad endings; no frightening characters; nothing that could cause nightmares), name validation to avoid awkward inputs, and a parent preview mode showing the full story before it is read aloud.

8. Bedtime extras: a soft lullaby fade-out after the final page, a 'one more tiny story' short mode (90 seconds) for negotiation nights, and a printable PDF storybook option.

9. Family sharing: invite a grandparent to read and record their own narration over a story, saved for replay.

10. Parental controls: daily story limits, screen-time awareness tips, and a clear note that stories are generated and should be previewed.