There was a family in Peel called Galbreath which seems to fit John Galbraith. The surname changes from Galbreath to Galbraith, Gilbraith and even Galbraeaith along the way.

1851 at Shore Road Peel

Peter Galbreath 47 Boatman Coastguard, Greenock

Catherine 42 wife Peel
Catherine 17 Dau. England
Peter Bridson 12 Douglas
John 10 Scotland
Thomas 8 Scotland
William 4 Scotland
Bridson 2 Scotland

IGI adds,

Eniss ch. 1852
Jane ch. 1856
James R Kermode ch. 1830

Peter Galbreath married Catherine Kermode 1832 in German, she was the daughter of Thomas Kermode and Catherine Bridson hence the repeat name amongst the children.

Len Faragher