I don't think that Mr William Howe born in 1803 in Scotland can be the son of William Howe, Free Settler "Atlas" 1816 andMary Howe, Free Settler "Atlas" 1816
Their son William Howe was born in Australia in 1817 and is evidenced by the 1828 Australian Muster / Census
Howe, William, 50, came free, Atlas, 1816, Protestant, landholder, Airds
Howe, Mary, 46, came free, Atlas, 1816, Protestant
Howe, Jane, 19, came free, Atlas, 1816, Protestant
Howe, John, 25, came free, Atlas, 1816, Protestant
Howe, Thomas, 24, came free, Atlas, 1816, Protestant
Howe, Ephraim, 18, came free, Atlas, 1816, Protestant
Howe, William, 10, born in the colony
Howe, George Molle, 8, born in the colony
Howe, Edward, 6, born in the colony
Howe, Henry, 4, born in the colony