Just wanted to be sure as the reference to an Alexander in 1801 opens up another story.
A Ronald had this son by a Margaret McNaughton not Elisabeth.
None of the 1841 dates add up eg Elisabeth would have been about 14 when she had Margaret(1803) and 16 when she had Archibald(1805).Ronald would have been married twice by 18.
The large gap to Helen in 1826 and John in 1828 raises other questions.
They are not on SP so I guess they were born when Ronald was soldiering.As a long shot try to trace his Regiment's barracks and then look at the English parish records.
Helen didn't get married in Comrie so perhaps she went to England or emigrated after her father died.(He isn't on Comrie death records.)She probably knew she wasn't born in Comrie so if she changed her place of birth that makes her virtually untraceable.
