Harry Potter and the Deathly Hallows
by J.K. Rowling
Affiliation: Dumbledore's Army (D.A.)
House: Gryffindor, 7th Year
Because Seamus's father is a Muggle, he's hiding out with Neville and other members of Dumbledore's Army in the Room of Requirement. He fights in the Battle of Hogwarts.