She only stipulated that they should be high and well-born.
"Well, of course the proper children to play with her would be the Twins--Mrs.Dangerfield's boy and girl.

They're high and well-born enough.

But I doubt that they could be induced to play with a little girl.

They're independent young people.

Besides, I'm not at all sure that they would be quite the playmates for a quiet princess.