Mulhollands Scotland

Thomas Mulholland was born abt 1785, place unknown. His wife Mary was born abt 1785 (maiden name and place unknown).
Their son Alexander Mulholland was born Oct 7 1810 in Rothesay, Isl of Bute. He married Mary Sanderson (Born mar 4 1812 in Caldbeck, Cumberland) in 1832 at Carlisle.
They emigrated to australia on the "Argyle" in 1852. At the time they had 3 children, Thomas 20, Mary 6, jane 1. Another Child Maria Argyle was born on trip out.
I have an extensive tree of descendants of Thomas but now looking for details on Thomas and his ancestors