y/n was mattheo riddles girlfriend for 6 years. they broke up . nobody heard from y/n until she comes back to hogwards with a 1st year kid . y/n is in her 7th year. she tells everyone its her little brother but in reality its mattheo and y/ns son. nobody suspects anything apart from mattheo and theo nott. mattheo kept to himself after they broke up. he didnt look at anyone else but y/n(i know the ages dont make sence but lets ingnore that)