Richard: I was surprised that I couldn't find Margaret Abel and her parents, William and Jane in my files. I have an extensive family tree of Abels in Aberdeenshire assembled.
I do have a William who is possibly your William.Chr 30 Jan 1806 Old Machar, Aberdeenshire, son of John Abel and Sophia. I do not know Sophia's surname, she is given as Sophia Abel on her father-in-law's cemetery monument and it is odd that a married surname is given. The old Scots didn't usually do that.
I would like to make my Abel tree as complete as possible, Do you have any other information about Margaret's family?