In the bath tonight, M said that C doesn't love him. When asked why he thought that, M said, simply, "Because he doesn't say it." And now it gets tough. You see, it's obvious to us how much C loves his brother, but this is one of those simple, human things C just can't do on his own. Sure, if we script it, he'll say it, but it's not spontaneous, and now even M is starting to notice.
And so the conversations begin: "M, your brother does love you, he just needs help saying it." Because M is a bright and empathic boy, I trust that he'll understand.