Isobel MacDougal has been stated to be (in Harry Potter and Me) but I am not sure if it is ever mentioned in the series what house Morag is in (and it is unclear if they are the same person). Pack Alpha of Europe 03:44, September 18, 2011 (UTC)
In zPottermore, Morag MacDougal are not renamed and she is a Slytherin, and i think she is a Slytherin, probably Isobel MacDougal is a Sister.
We cannot rule out that Morag and Isobel are the same person just because Isobel never appeared. Yes, JK Rowling might have changed the name, but it is unsure. So I think her house should not be stated Ravenclaw without evidence. In the first book, Neville gave the hat to Morag, but we do not know what house did the sorting hat shout, so her house is unknown. AB NgTalk 03:59, July 12, 2014 (UTC)