Can I act as my brothers therapist? ?

My step brother just started living with us, due to being abused by his mother and sexually abusing his little sister. His therapist here has cancelled on him many times. I am majoring in psychology and I'm just wondering if it would be ethical if I started acting as his therapist, or if this would be a bad... show more My step brother just started living with us, due to being abused by his mother and sexually abusing his little sister. His therapist here has cancelled on him many times.

I am majoring in psychology and I'm just wondering if it would be ethical if I started acting as his therapist, or if this would be a bad idea?
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