Good Morning Alan,
I could not find a Jessie in 1851 Census. Checked adjoining homes in case she was with a neighbour. No poor law applications. This entire family is missing from 1861 Census. Except there is a Jessie Scott in Renfrew with grandparents Anthony and Jane Reid. It was Janes 2nd marriage. She was the widow of Peter Scott ms O’Neill or Neil. I could not find a Robert born to Peter and Jean. I have chased this to no end but still have them as a hypothesis in my tree. In 1841 the Burks lived at 60 Charley Close Bridgeton, In 1851 at 220 Main St Calton, Glasgow and in 1871 Margaret was with Jessie and Alexander McDonald at 17 Thistle Street, Govan. Her mother and brother Peter were at 181 Main Street, Calton. I think the surname must be badly mangled in 1861.
Anna