Yeah, but I think it can be linked to his paranoid psycopathy, triggered by the traumatic event of his father's death.
If I understand House's timeline, Robert was just a little child, so who'd stop Anthony when he stole Robert's inheritance? Yes, it is sad that Anthony's sanity went the way of the dodo, but the fact of the matter is, he took his brothers inheritance purely out of greed. I'd say the real topper to Anthony's mental breakdown was when he realized his brother was passive aggressively getting revenge on Anthony for his crimes.
Edit: Doom, I think there MAY have been some confusion on the World Designers and Writers parts, because there are either two stories, either Robert, through RobCo, bought up as many television screen casings, then attacked Anthony through the stock market, or, Anthony snapped when Robert bought/attempted to buy it out. Because if memory serves, Robco was buying out H&H Tools shares like crazy.