M has a way of letting us know what her brother needs. It's as simple is interpreting C's "eh" as "Mama, C wants something to drink". I wonder if it is because M is down at his level, or perhaps she is still young enough to remember what it was like to be one-year-old and unable to verbalize; but she seems to really *know* C in a way that none of the rest of us can. Its a special relationship between sister and younger brother. She looks out for him.