Known Family Members
- Seamus Finnigan: a Gryffindor student in Harry Potter's year at Hogwarts School of Witchcraft and Wizardry and member of Dumbledore's Army
- Mr. Finnigan: a Muggle who was shocked to learn that his wife was a witch shortly after their marriage; Seamus' father
- Mrs. Finnigan: a witch and Seamus' mother
- Fergus: Seamus' cousin. Fergus has to be Seamus's maternal cousin because he is a Wizard, like Seamus's mother.