The 4 " Lost Boys " as I've come to call them, are as much a mystery as ever, and nothing I've done has given me any leads.
They are George 11 Feb 1809, Andrew 22 Apr 1811, Robert 3 Apr 1813, and James 14 Dec 1815. George and Andrew were born in Tibermore, and Robert and James in Perth about 5 miles away, both Parish Perth & Kinross, SCT. (George was the only one not baptised - which usually indicates death at birth.)
William, born in 1816 is the only one who accompanied James & Ann to Montreal in 1818.
James, their father was the son of George Bothwell of Oldmeldrum Parish, Aberdeenshire, born in 1854 in Parish of Tarves (next door). George's father was William. Luckily this family stuck strictly to Scottish Naming Tradition.