Alexander Stewart was born in Perthshire, Scotland in 1675. His parents were John Stewart and Janet Murray.
His wife was Catherine Montgomery born in Donegal, Ireland.
The only son I have is Alexander Stuart b 1706 in Ireland he married Mary Catherine Stewart?
The children were Alexander Stewart b 1744 in Londonderry, Ireland, John Stewart b 1727 in Londonderry, Samuel Stewart b 1732 in Londonderry, Joseph Stewart b 1735 in Londonderry, William K. Stewart in Londonderry, Archibald Stewart in Londonderry.
I have more but I believe this is where your ancestor probably started. If you want to contact me my email is firstname.lastname@example.org