Child theme not using content?

My son started a site using Simple, adding images and content in the Frontpage Featured, About, Testimonial, etc. sections. I suggested he create a child theme to avoid problems when Simple gets updated.

After creating child theme using One-Click Child Theme plugin, images and content added to site do not appear. Instead, child theme uses original content included with theme.

What’s needed to create a child theme of Simple that will use content already added?

Thanks in advance for help or advice.