Thanks for the link Jane, very interesting to learn about Fredericks brother in Kalamazoo. I am not sure the Fred that is mentioned in the article is the same as the one who settled at Paraparap, Barwon Downs.
The article places him in New York and then Kalamazoo from 1836-1841, however the Victorian records have him married in Melbourne in 1841 to Cattherine Bond and three children from 1841 to 1843.
Further,from Tasmanian Archives website (passenger search) and The Argus (through NLA website) there is mention of a Capt. fred Dewing being master of a ship "Tamar" that journeyed regularly from 1836-1839 between Launceston and Sydney, finally at Port Philip in 1839.
I wonder if the Frederick in the US is an older brother. The Victorian BDM has Fred Dewings death in 1859 mentions parents Elizabeth and Richard. Another Dewing, Henry died in 1880 same parents. Do you know of any of their other children?
Cheers Matt