Looking for Stewart S of Mimbi and Descendants of William Watson Allan B1973 Scotland

I am trying to trace my Grandmothers family tree. Her name was Jane STEWART and was born at Minmi. I have been told they were originally from Scotland (Glasgow) but how far back who knows.

I know she had a sister Agnes who married William Watson Allan who was born 1873 at Haughmill, Scotland.

Jane STEWART's married name is THOMPSON and she had 3 children.

Thanks, carmol21