Do not fret. You can share a copy of a Google file with them in an Office format. They can then edit the file in Office and send it back to you.

Here’s how you can send an editable  copy of a file in an Office format

  1. In DocsSheets, or Slides, open the file.
  2. Click File > Email as attachment.
  3. Under Attach as, choose Microsoft WordMicrosoft Excel, or Microsoft PowerPoint.
  4. Enter the email address, subject, and message.
  5. (Optional) Check the Send a copy to myself box.
  6. Click Send.