I don't remember so many teacher student relationships in this story. But now we have one of Sakura's 4th grade classmates getting engaged to her teacher, Sakura's father getting married to her mother when she was 16 and he was 27 and her teacher, and now Sakura's brother and his teacher (that's not 100% sure). What the heck is going on with student-teacher relationships in this manga?! It is kind of disturbing how they are presented...