Looking for information

Ok I am re-posting something since it has been awhile...{I'm new here, just trying to find my son and his adoptive parents. I lost contact with them some time ago and want to reconnect. Their names are Linda and David. My son I named Kevin but his parents named him Graeme. I'm in BC and have no clue how to re-find them. Plus I don't have any copies of the adoption forms and only know that a Heather Barnett was the lawyer I had talked to. So I await any suggestions and info from ya'll. } I just want to find them to say hello and check in to make sure everything is okay, my son at home is almost 11 and he asks about his older brother sometimes..My 11yr old is Autistic and so I get curious, does my other son have it? Do they share the same traits? That sort of thing....I'm on Facebook.com alot and hope someone might give me some answers.