I don't know who Edward bur 1830 s/o Mathias is

I still think Edward b 1802 s/o John Caine & Ann Cannon md Elizabeth Cannon 12 Jun 1826 Braddan
and is the baker.
1841 Census Index
Douglas 8 3 12
Sand Street
Edward Cain head married 37 baker
Elizabeth wife married 33
John 13
Elizabeth 11
Edward 8
Sarah 6
Robert 3
Isabel 1mo
William Cain 17

1851 Douglas 73 Sand Street
Edward 48 Baker & Flour Dealer, Elizabeth 43, Edward 19 Baker, Sarah 16, Robert 13, Alice 7

Established a bakery, later owned by P. Shimmin, in Strand St Douglas

Maybe this will tell something??
Wills
CAIN, Edward 1879 Onc A 39 0106488

Maybe it is back to the drawing boards for us all??