Hi Katlie
I think you are correct abut the relationship between the brothers.
WILLIAM POLWARTH/ELISABETH BAIRD had 4 children at Foulden between 1818 & 1824
WILLIAM POLWARTH/ELISABETH BAIRD had DAVID, JAMES, ALEXANDER & MARGARET at Whitsome and Hilton 1826 – 1833, plus GEORGE 1835 at Ladykirk.
In 1841 most of the family are at Dykethead, Whitsome and Hilton, plus Young Polwarth age 4.
Colin