Properly "¿Cómo está tu madre?" and means "How is your mother?"
Cómo estás tu madre = "how is your mother"
como estas - how are you? and if someone asked you como estas, you would answer such as "bien(good), y tu(and you)?"
Como estas tu hermano?
IT CAN BE TRANSLATED TO ENGLISH AS FOLLOWED. How are you my friend?
"como to estas entose" doesn't really means anything!... maybe you meant "cómo estás tu entonces?" which means something like "so, how are you doing?"
It is a nonsense sentence that translates to: I am a your friend and how are you?
Como estas tu exams?
Bien et tu - well and you
Translated to: "I am well, how are you, what are you doing?"
Bien, y ¿tu como estas?
Como se llama tu mama?
Mama with an accent on the second a or madre.
"tu madre!" (too mah dray.) How is your mom? is "Como esta tu madre?" (with an accent on the first o in como and the a in esta)