The 1841 Census recorded:
Tresco Northward, Tresco, Isles of Scilly, Cornwall:
Jonas Nicholls, age: 30 years, occupation: shoemaker, born: Cornwall
Rebecca Nicholls, age: 30 years, occupation: shoe-binder, born: Cornwall
John Nicholls, age: 7 years, born: Cornwall
Harriet Nicholls , age: 5 years, born: Cornwall
Jonas Nicholls, age: 3 years, born: Cornwall

The 1851 Census recorded:
Parade, St Mary’s, Isles of Scilly, Cornwall (at the residence of Samuel and Fanny Sanderson):
Harriet Nicholls, servant, age: 14 years, occupation: house servant, born: Tresco

At the time of their marriage in 1860, Harriet was noted as a spinster, aged 24 years from Tresco, father, Jonas, a shoemaker and Francis a bachelor, mariner, aged 24 years from Tresco, father, Francis, a labourer.

Harriet was noted in her brother John’s correspondence of 1884 (refer transcript under John Nicholls).