Looking for John Buchanan Mayne of Dublin Ireland

I am seeking information regarding John Buchanan MAYNE, Attorney/Lawyer of Dublin c 1838-1850. His wife was Margaret STRONG. His son William John Buchanan MAYNE (born c 1831) married Jane Marion BERNARD in Liverpool and emigrated to Australia in 1853. He died in Canterbury, New South Wales in 1899. Mary Jane MAYNE, the second daugher of John Buchanan MAYNE, was born c 1838, emigrated to Australia and married John Macbeth BELL in Brisbane in 1868. Mary Ann died in Western Australia in 1915. The name of his first daughter is not known.