Helen Lovecraft

Helen Allgood (1820 - 1881): Lovecraft’s paternal grandmother. Wife of George Lovecraft, whom she married in 1839. She gave birth to five children: a stillborn, Cordelia Amanda, Emily Jane, Winfield Scott, and Mary Louisa. Her sister, Augusta Charlotte Allgood, who was 22 years her junior, was adopted when she was 10 by George Lovecraft upon the death of her father, making Helen her own sister’s mother.

source: http://www.hplovecraft.com/life/family.aspx