I strongly suspect that Margaret CALDWELL (nee GUTHRIE) 1788-1817 was sister to my gt gt gt grandfather David GUTHRIE, farmer, b Monkton 1780. But unfortunately, Margaret's death reg does not give her mother's name! She married Robert CALDWELL (1775-1847) Nov 1817 Coylton. Children (there may be more) David 1811-1855, Margaret b 1818, Robert 1821, James 1824, Anne 1827, Wm 1830.
Do you have their grave inscription? If not I can send it to you - it has more info..