I have a Margaret Duggan born in Stranraer on 11 Jan. 1780. Members of this family were later known as Dugan or Dougan. I nave no information as to what became of this Margaret. However there was a Margaret Dougan who died on 13th May 1846 age 59 yrs. She was the wife Samuel Thomson. The age does not match Margaret from 1780 but we all know that ages on headstones are not always accurate. Then again this Margaret fits the time frame for the Houston family. Bill Dougan