How did all of the Weasleys have red hair?

Having red hair is a trait that runs in the Weasley family, so that is why all the Weasleys we meet in the books have red hair. The fact that Molly Prewett Weasley also had red hair would just make it even more likely for the children to have red hair. read more

The Weasleys have a long history of being Sorted into Gryffindor House, Molly and Arthur along with their seven children were all Sorted into the House. During his time at Hogwarts Bill was a prefect and Head boy in his seventh year. read more

Call it karma, but when James and Oliver Phelps were cast in the Harry Potter films as the red-headed twin wizard brothers of the equally flame-haired Ron Weasley, James knew that he was in for a spot of payback. read more