In 1823 Jane Mary Trevenen was named as a beneficiary in her father's will, to receive £1,000.
In 1829 Jane was a beneficiary of the will of her brother the Rev. John Trevenen, rector of Creed, receiving £1,000.
In 1841 Jane Grylls, aged about 40, born in the county, and husband Glynn Grylls, aged about 40, born in the county, solicitor, were in Cross St., Helston, Cornwall. With them were children Mary (10), Glynn (10), George (5) and Charlotte (5).
In 1851 Jane M. Grylls, aged 51, born in Helston, and husband Glynn Grylls, aged 50, solicitor, banker, major, magistrate, were in Church St., Helston. With them were children (born in Helston) Mary T. (22) and George W. F. (19), solicitor's articled clerk.
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Jane Mary Grylls of Cross St. died aged 52 years (burial record).
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At Helston, on the 23rd instant, Jane Mary, the beloved wife of Glynn Grylls, Esq., aged 52.
Royal Cornwall Gazette, Friday, 26 Sep 1851, p. 8