She became very sickky during pregnancy of Robert and was hospitalized for considerable time when dt was preschool age.

His father was a monster and had no time for little children so his older sisters looked after him according to biograpy-type books written Bout him. Her illness continued for years. Speculation is that post partum depression added to it, so even when she returned, she paid little mind to them.

He clearly learned that he was "special" and could strike out at others with zero repercussions during that time frame. He also began hurting Robert then too.

By the time he reached elementary school age, his personality was set and no amount of discipline worked on him.