A shocking lack of "My Immortal" knowledge from the Pointless researchers.
The only house named in canon is Hufflepuff, one of them has their blood sucked by Vampire Potter. Pointless seemed to prefer some badly-written fanfic in the same universe.
But I'm intrigued by the idea of Alexander Armstrong giving his children a dramatic reading of Tara Gilesbie's masterwork.
(Deep voice) Hi Ebony Dark'ness Dementia Raven Way. Isn't it time for..?