Agatha Wastell's mother was Caroline Mathilda Whalley (she was married to Captain Samuel Whalley). Caroline's single name was Barclay. She was the daughter of the Rev. William Barclay. Nancy McLaughlin of Scorton Wastell fame found the will of Rev. Barclay. He was well known for making Barclay's Antibilious Pills. His wife was Elizabeth ? (found in Old Bailey online, and he was possibly married at least twice as Caroline Mathilda Barclay seems to be about 20 years older than her siblings. Her siblings are: Lucy Barclay, Agatha Barclay, Priscilla Amelia Barclay and Wilhelmina Janet Poole (she was widowed before death, but this cannot be her married name as she was only age 7 when her father died in 1809). Lucy Barclay is the oldest of the four younger siblings, and she was born in 1791. Caroline Mathilda's first child Caroline Elizabeth Whalley, sister of Agatha Whalley, was born in 1795 (hence my suggestion Caroline was much older and likely born to a different marriage. The four younger sisters are living in Chelsea in the 1841 census and two of them are in Chelsea in 1851. They all died before age 60. It seems this Barclay was part of the family that produced the banking Barclays because the baronetcy passed to William Wastell of Hoxton House (the Rev. William Barclay had no sons). This information came from Complete Baronetage, ed. G.E.C., Vol. IV, 1665-1707, Exeter, William Pollard & Co. Ltd. 1904, p. 272. I have not been able to find where Rev. William Barclay fits into the family. The baronetcy was passed to Sir William Henry Wastell who went to Melbourne, but ceased with his son Charles. In the Gentleman's Magazine, where William Wastell and Agatha Whalley's marriage is reported in 1822, it states she is the granddaughter of the Rev. William Barclay.