Peter,
Hello, dear. This is Sandra Bennet, Claire's mother. We met briefly at your sorting - I hope things at Hogwarts have been going well for you! I meant to owl you much sooner, but (as I'm sure you're aware) Claire's recently arrived at the school, and the bulk of my time has gone towards seeing that she's settled in and safe.
I'm writing to you with a slightly ulterior motive. I'm having a small dinner this Sunday, and I know it would mean the world to Claire if you were to come.
Love,
Sandra
Mr. Petrelli,
This is Sandra Bennet, Claire Bennet's mother. It would seem that you and I have some things to talk about. I'd greatly appreciate it if you would meet me for tea.
Sincerely,
Sandra Bennet