Hi,
The 75th was raised in Stirlingshire, Scotland, I do not know how close to Stirling they recruited, but I assume John was born in the area.
Our family has it that Catherine was born in Castlebar area, in west Ireland.
Children were Thomas my line 1828, in Fermoy, Julia in 1830 in Chatham England and William 1833 in Cape Town South Africa.
I assume that this was where the 75th was garrisoned at the time.
I think that the family stayed in South Africa after 1833, but I can’t find any evidence of that.
Hope this helps,
Will