I don't know if they always are. My older nephew spoke 'for' his slightly younger brother a huge amount, which I think probably either exacerbated or masked the

I don't know if they always are. My older nephew spoke 'for' his slightly younger brother a huge amount, which I think probably either exacerbated or masked the younger ones language delays. (I wasn't involved in any of the diagnosis/therapy process so this is just my opinion).