The obvious problem you are likely to have is that the name is so common, and there are likely to be numerous people with that name.
Can you tell us the information on Sarah and Mary Ann’s birth certificates please?
Yeah the name is really common, even when I search in Wales.
I have both their birth and baptism certificates. If I knew how to attach them I would.
Mary Burns (Illegitimate) Born 26 May 1889 in East Poor House Dundee. Mother Mary Ann Burns, Jute Spinner, domicil (??) South Church Street Lochee.
Her Baptism certificate (I think it's hers as the birthdate, name, and mother's name is the same) was registered in St Sylvesters in Elgin, sponsor Mary Wilson of Clova(??) or Cluva(??).
Sarah Burns (Illegitimate) Born January 22nd 1884 in East Poor House Dundee. Again mother is listed as Mary Ann Burns, Jute Spinner. Domiciled at - it's really difficult to read but looks like 111/117 High Street Lochee.
Her Baptism certificate is in St Marys Lochee Dundee and the sponsor is Maria Donnelly.
My great grandmother is Mary Burns. On her marriage certificate in 1909 it lists her mother as Mary Ann Holt (Mary Ann Burns) - deceased. Her father as James Holt, Stonemason - deceased. I found a James Holt - married to Mary Ann Burns, in Kinross. He died March 22nd 1889 and is listed as labourer (vagrant) found by inspector of the poor.