Come tu almuerzo
The first one is saying, “eating your breakfast.” The third one is saying “we’re eating your breakfast” and the second one says “eat your breakfast”
Form questions using inverted word order. Put the subject at the end.
This is correct. This is a reflexive verb that you are doing to yourself. This translates to, "Normally I brush the hair". If it was something like "Normalmente me cepillo el pelo de Anna" it would be incorrect because you are doing it to Anna, not yourself.