Doesn't translate

I have some neighbors who speak Spanish at home. The 5-year-old didn't learn English until he went to kindergarten, which seems like a hardship, but is actually very good because he'll be fluently bilingual without having to study for years. Anyway, sometimes his 2-year-old brother is whining and I can't figure out what's wrong. So I ask, "Jose, what's wrong with Pedro?" "I don't know." "Well, ask him what's wrong." "Pedro, what's wrong?" Um, try Spanish! Silly kid. And whenever I ask him how to say something, he grins and claims not to know.