The 8-year-old son of Linux superstar Hans Reiser testified at his father's murder trial here Thursday that his grandparents told him his dad did something terrible to his mother, Nina Reiser.

The defense is attempting to portray to jurors that the boy's grandparents have brainwashed him to believe his father hurt his mother in a bid to explain pictures and recollections the boy had of his father carrying "somebody" down the stairs in a bag the night his mother went missing Sept. 3, 2006. The boy told jurors that story two days ago.

The boy testified Thursday he was with three social workers last fall when he drew the picture of his father on the staircase. He said he was in Russia, where he is living with his younger sister and the parents of his mother.

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