stepbrother
half-brother
half brother

The world would at last be free of her half brother and his evil rule.

"Just like my half brother, you'd give all in your power to kill me."

James turned and looked his half brother in the eye.

This time, the twins and their older half brother weren't left behind.

He was a good man, the opposite of his half brother.

He would be thrilled to come to know a half brother.

She tried to imagine Michael pulling her to him as his half brother had.

That her half brother was a political figure of great importance.

He, too, had a lot of younger half brothers who wouldn't mind the job in the least.

I had gone into Afghanistan to bring back my half brother's son.