In an interview with twins James and Oliver Phelps (Fred and George Weasley) published April 2020 in Wizarding World, the actors revealed which house they were sorted into — and they aren't the same! James Phelps is a Hufflepuff, about which he said, "Which is cool, but even cooler as I actually have a badger living under my shed." Oliver Phelps is a Gryffindor, just like his character. He said, "I was put into Gryffindor, which I was very happy with. It helps when you already have the uniform!"
Image Source: Getty / Christian Marquardt