Crispin is a wonderfully efficient fellow, isn't he?

I did wish to speak to you about one thing: I would appreciate it if you would write both Mr Marvolo and your son letters, regarding the proper care and keeping of Mudbloods. I can only guide them so far; I believe a male perspective would do wonders. Creevey was no trouble for a boy as self-assured as Marvolo, but your son is not of the same temperament, and I believe that young Marvolo will require some guidance in keeping the Granger creature under control.