Sir James Edmonstone of Duntreath, 6th of Duntreath - Only four known children by Helen Stirling

The James Stewarts may be mixed up.
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Current profile for James Stewart
James Stewart, of Ballintoy
Gender: Male
Birth: circa 1542
Isle of Bute, Scotland
Death: before circa 1600
Immediate Family:
Son of Archibald Stewart of Largyan and Anne Stewart
Husband of Isabella Edmondstone

https://www.wikitree.com/wiki/Stewart-21017 has:

James Stewart
Born about 1542 in Glasgow, Lanarkshire, Scotlandmap
Ancestors ancestors
Son of Archibald Stewart and [mother unknown]
[sibling%28s%29 unknown]
Husband of Isabella Edmondstone — married about 1574 in Glasgow, Lanarkshire, Scotland
Father of Ninian (Stewart) Stewart of Kilchattan
Died 1600 at about age 58 in Ireland

With wife: Isabella Edmondstone (1555-1640) (no parents)

References

1. The Stewarts of Ballintoy: with notices of other families of the district in the seventeenth century by Hill, George, 1810-1900; https://archive.org/details/stewartsofballin00hill/page/n15: http://quoddybelle.tripod.com/HisGenMcCurdy.html

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Also see https://our-royal-titled-noble-and-commoner-ancestors.com/p5932.htm...

James Stewart, Captain of Dunavaig, Ascog, & Isle of Bute was born circa 1560 at Isle of Bute, Argyll, Scotland.1 He died in 1600 at Scotland.1

Family
Child
Ninian Stewart, Laird of Ballentoy Castle+1 b. c 1582, d. 1669

This is what I got for an updated James Stewart, of Ballintoy

There is uncertainty that his given name was James; what we know is that "sons of Archibald" moved to Antrim from Isle of Butte. There is no supporting evidence that his wife was called Isabella Edmonstone.

From Stewart Clan Magazine, Volumes 1-10 (1922) page 34 < GoogleBooks >

James Stewart12 (Archibald11, Ninian10) was settled in Antrim, Ireland, about 1560. This was long before the plantation of Ulster by the Scotch, which began about 1610, at the same period as the English colonization of America. This Stewart family from Bute settled first at a place called Dunseverick but later moved to Ballinstraid [now Straidh], in the parish of Ballintoy. James died before 1600, having four children:

1. Ninian, born about 1525
2. David, had three sons
3. Jean
4. Christian, married Brien Dunlop

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I'll detach wife of James Stewart from parents.