Dearest Mum and Dad,
I am perfectly all right, I assure you. I know Percy has been writing and he has probably said all sorts of things, but there is absolutely nothing to worry about. I was feeling a little ill last week, but it must have been worry more than anything else. Hermione has been attacked, you see. It's awful. But Professor Sprout said she will have the Mandrakes ready for the potion too late, they'll all di by tomorrow evening, and everything will be fine.
Fine, Mum. Everything will be fine. I will be fine. I am not ill, I am not going to do anything that will put me in danger, and I shall remind my brothers to do the same. Please don't worry. Please help m
Summer holidays are near, and soon you will have all of us back home with you. Safe and sound.
I love you both.