I think that your line is descended from Jonathon Abbey.Please advise if you have Birth Certificate Nos. for William's children, if not I can help. Do you have details of Williams marriage or birth?If I know exactly what you are looking for I should be able to help you. You can contact me directly if you like firstname.lastname@example.org
Jonathan could be related to us as Brian Abbey had a brother by that name and I believe that he came to Australia prior to Brian & Mary who arrived in 1848.