Em Relíquias da Morte , nós testemunhamos a memória de Snape de sua Seleção (e ele estava no mesmo ano que eles). Nós vemos a Lily e os quatro Marauders todos classificados na Grifinória:
Then Professor McGonagall said, “Evans, Lily!”
He watched his mother walk forward on trembling legs and sit down upon the rickety stool. Professor McGonagall dropped the Sorting Hat onto her head, and barely a second after it had touched the dark red hair, the hat cried, “Gryffindor!”
[…]
The roll call continued. Harry watched Lupin, Pettigrew, and his father join Lily and Sirius at the Gryffindor table.
Como alternativa, alguém fez essa mesma pergunta em uma entrevista de 2004 com a JKR :
What houses were Sirius Black, Remus Lupin, James Potter and Remus Lupin[sic] in? Everyone tells me they were all Gryffindor, but I won't believe it unless I hear it from Ms. Rowling herself!
JKR: This is JK herself saying that they were indeed in Gryffindor!
Sim, os Marotos estavam na Grifinória.
(suponho que a segunda menção de Lupin fosse Pettigrew.)