All Scottish records are available online at www.scotlandspeople.gov.uk This is a government dept and you can see/print copies of the actual records (no transcription errors!) for a small fee. I looked for his birth to start you off - attached. You'll see on that you get his parents names and you'll see his father was a doctor. You'll probably find it easiest to get marriage next and death certs will tell you the next generations names. The census reports are an easy way of finding siblings, but Thomson is quite a common name. Enjoy it! Celia