There are no such schools to which he could send his sons in France, for what large schools we have are under the management of the fathers, and the boys have none of that freedom which is the distinguishing point of the English system of education.

Even if there were such schools, I am sure that madame my sister-in-law would never hear of her sons being sent there.
"Since this is so, the marquis has concluded that the best thing would be to have an English boy of good family as their companion.
He would, of course, study with them under their masters.

He would play and ride with them, and would be treated as one of themselves.
They would learn something of English from him, which would be useful if they adopt the diplomatic profession.

He would learn French, which might also be useful to him; but of course the great point which my brother desires is that his sons should acquire something of the manly independence of thought and action which distinguishes English boys.
"Having arranged this much, I thought of you.

I know that you have several sons.