In 1851, he was still resident in Tarbat, Ross and Cromarty, but by 1856 he was documented in Prince Edward Island.
On 8 April 1856, he was baptised Catholic in St. Anthony’s Church, Bloomfield Parrish, Prince Edward Island, by Father P. McIntyre. His age is listed as 24, his father is listed as James Munro, and his mother’s surname as Mary Hall of Pictou, Nova Scotia.
One can only assume that this conversion took place so that he could wed Catharine McDonald.
They seem to have had several surviving children:
- Mary Jane (1 March 1858)
- Elizabeth Ann (10 February 1860)
- Joseph King
- Elizabeth (25 March 1864)
There may have been other children; however, records from Prince Edward Island during that period are extremely difficult to discover.
By 1910, Duncan was listed on a U.S. Federal Census in New Haven, CT as a widower.
No death information has been discovered.