The maniac who killed 26 people inside a Texas church Sunday threatened his parishioner mother-in-law, officials revealed Monday.

Devin Patrick Kelley “made threatening text​s​ to ​his ​mother in law who went to ​the ​church,” said Texas Department of Public Safety regional director Freeman Martin.

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The woman, who was not named, attends the church but was not there during the massacre Sunday, authorities said. Martin would not say whether the woman’s membership with the church motivated Kelley.

“We know that he expressed anger toward his mother-in-law.”

Officials also revealed that the youngest victim killed was just 18 months old. Previously, a 5-year-old was thought to be the youngest of the victims, whose ages range up to 77.