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It states Katherine Smart is the head of the house and married.

I am wondering if the 5 year old boy john currie was from James smarts previous marriage , if there was one ?

Thanking you so much for your time

No reason why John Currie Smart shouldn't be Katherine's son. She married in 1894, and the census was 1901.

The marriage record image would tell you if James had been married before, but there's no reason to think so from the 1901 census.

If you want to hunt for him in 1901, you'll have his age on the marriage record.

Going back to your original question about the Douglas line, the marriage between Mary Douglas and James Chirnside, which Gins posted on page 1, will give you Mary's parents' names and when they married.

Then from her parents' marriage record, you can go back to the previous generation, and so on, until perhaps you'll be lucky enough to find the link with Tantallon Castle!
If you don't find it, but are really obsessed, then once you get back before 1855, you can also search for siblings, in case the link is through one of them. For births before 1855 you can include mother's maiden name in the search, which makes it easier.

Although, to find the link, you'd have to go back to before 1699:

Tantallon Castle
From Wikipedia, the free encyclopedia

Tantallon Castle is a semi-ruined mid-14th-century fortress, located 5 kilometres (3.1 mi) east of North Berwick, in East Lothian, Scotland. It sits atop a promontory opposite the Bass Rock, looking out onto the Firth of Forth. The last medieval curtain wall castle to be constructed in Scotland,[1] Tantallon comprises a single wall blocking off the headland, with the other three sides naturally protected by sea cliffs.

Tantallon was built in the mid 14th century by William Douglas, 1st Earl of Douglas. It was passed to his illegitimate son, George Douglas, later created Earl of Angus, and despite several sieges, it remained the property of his descendants for much of its history. It was besieged by King James IV in 1491, and again by his successor James V in 1528, when extensive damage was done. Tantallon saw action in the First Bishops' War in 1639, and again during Oliver Cromwell's invasion of Scotland in 1651, when it was once more severely damaged. It was sold by the Marquis of Douglas in 1699 to Hew Dalrymple, Lord North Berwick and the ruin is today in the care of Historic Scotland.