Steve was Rudyard Shelton's stepbrother. A comment by Rudyard implies the two did not get along very well.
After the Dragonstorm incident, when Admiral Donald Tennes offered Shelton 4 million in hush money, he requested it be split into four pieces, and a quarter of it go to Steve. He requested it be anonymous as they were "not on the best of terms," so the money was staged as a lottery win. (Disruptive Selection)