So I recently found out that dad isn't the biological father. Shook my world but I want to find out who is, not sure of spelling of last name but his name is Peter and wife's name is Kathy and know that they had 3 adopted children in 1982 so any suggestions on where to start with the search.

He was working for Pioneer concrete in melbourne at the time but they have since been delisted and sold on so not sure where to start? I think they lived in Sydney at the time and he travelled for work?

Not completely sure of how to spell last name either Lovett? Lovat? Lovatt? Don't think he knows I exsist but who knows...
Any suggestions would be welcome
Thanks
AT

Also we live in australia

I always ask this, with adopted kids I counsel, WHY,
You have parents you have a father ( good or bad) that raised you. A man who sleep with a women to get her pregnant does not make him a real father. Who you are and what you are came from the man and women who raised you.

With that said, what info have you parents given you about them?

If this is all, no real last name spelling of a somewhat popular name, hiring a PI is about all I can think of.