Imagine not recognising your mother, or feeling missing limbs or tasting music. When brain wires get crossed, these things can happen. Even to you.
You are an impostor (Capgras syndrome)
Capgras syndrome leads people to believe that a close acquaintance or loved one has been replaced by an impostor, or a double. So, even though they can recognise that the person looks exactly like their loved one, they are convinced it is someone else.