Mrs Finnigan was born to at least one magical parent. Being Irish, she presumably attended Hogwarts School of Witchcraft and Wizardry, likely being sorted into Gryffindor. She was a fan of Quidditch, supporting the Irish National Quidditch team. She met and fell in love with Mr Finnigan, a Muggle, marrying him without telling him that she was a witch. At some point after the Finnigans' wedding, she told him that she was a witch, which proved a "nasty shock" to him. They had a half-blood son named Seamus, who went on to study at Hogwarts.