Rightly or wrongly I've decided that the Jessie SINTON of Southdean who married Donald McFADEN is highly likely to be the daughter of James SINTON and Barbary OLIVER.
I'm possibly inventing history here, but given that Barbary died in 1809, a few short years after her marriage in 1804 and Jessie's age consistently implies she was born about 1810, that just possibly, Barbary died in childbirth.
The place names connected with Jessie and Donald whilst still in Scotland also lead me to believe there is a close connection to these SINTONs.
Anyway, I've updated the SINTON chart to reflect this. It was bugging me way too much having Jessie floating around without parents when there just had to be a connection.