LAFAYETTE COUNTY, WI (WTAQ) - A judge could decide next week whether an Argyle man is mentally competent to stand trial for helping start a house fire that killed his three nephews.

18-year-old Jeremy Wand is due in court next Thursday for a competency hearing before Lafayette County Circuit William Johnston. He’s charged with 3 counts of first-degree intentional homicide, two counts of attempted homicide, and one count of arson.

Prosecutors said Jeremy Wand helped burn down his uncle Armin’s house on September 7th, killing Armin’s three young sons.

Armin’s wife and their two-year-old daughter survived the blaze, but the woman’s unborn child was killed.

Armin Wand III is facing numerous charges in the blaze. But state prosecutors have not charged either defendant in the death of the unborn child.