I stand corrected, Filis cañi is right:Stepbrother: not a blood relation. If my mother died and my father married a woman with sons, those sons would be my stepbrothers.
Half-brother: If my father had a son with a woman other than my mother, he would be my half-brother.
A stepbrother or stepsister is the child of someone who has married one of your parents, either one.If you have a sibling and you share the same father (or the same mother, but not both) you are half brothers.
If you share the same mother (but not the same father) you are half brothers.
If you are not blood related you are stepbrothers.
Not correct. Only if you share both parents are you true brothers. If all you share is the same mother (but have different fathers) you are half-brothers."If you share the same mother you are brothers"