Jean Redpath's version ends with:

Oh faither dear ye've seven sons
Ye may wed them all tomorrow
For the fairest flower amang them all
Was the lad that I lo'ed on Yarrow

This confused me. (It didn't confuse me until yesterday, when I was singing it to myself and subsequently became confused.) Her ploughman can't be one of her father's seven sons. Not only would that be quite improper, but there is an obvious difference in rank. "The lad I loved on Yarrow," however, seems to me to refer to her ploughman. Does anyone know what she's talking about?