William Seymour Mearns

I am from australia and wish to trace my family tree back to its origions in scotland. My grandfather's name was William Seymour Mearns, his father however was the one who came from scotland to australia on one of the firts fleets. I will find out what his name was and date of birth and get back to you on friday. I would be very thankful to anyone who will help me with my inquireysthanks Timothy mearns