Oops. I lied. I forgot that I've managed to get Isabella Marr further back. Unfortunately I can't tell which of two brothers (William or David) was her dad, and thus can't tell who her mother was, but I know her grandfather was William Marr who married Margaret Henderson on 10th November 1771 in St Monans. They had seven children: Janet 1772, Jean 1774, Mary 1776 , David 1778, Betty 1780, William 1783 and John 1790.