Shooter's grandfather said family 'had no idea' he purchased 2 AR-15s week before shooting

Salvador Ramos’ grandfather revealed on Wednesday that the family had no idea the teenager had legally purchased two AR-15 the week before the massacre and described him as a quiet individual who spent most of his time alone in his room.

Ramos, 18, was shot and killed by police on Tuesday after fatally shooting 19 fourth-graders and two teachers at Robb Elementary School in Uvalde, Texas.

The gunman's motive remains unclear. He first shot his grandmother in the head at her home, then stole her car and drove it to the school, crashing into a ditch before entering the classroom and opening fire.

Ramos turned 18 on May 16 and soon after purchased two AR-15s and more than three hundred rounds of gun ammunition.

His grandmother, believed to be Celia Martinez, 66, took him out to dinner at Applebee's to celebrate his birthday.

On Wednesday morning, her husband Rolando Reyes, 74, told ABC News that neither of them knew their grandson bought the guns.

"I didn't know he had guns. If I had known, I would have reported it," said Rolando, who has a felony conviction and cannot be in a home with firearms.

Ramos' grandmother survived despite being shot in the head. She is in the hospital.

The shooter's grandfather also said that although he was quiet, Ramos would sometimes go to work with him.

"Sometimes I would take him to work with me. Not all the time, but sometimes. Last year he didn't go to school. He didn't graduate. You'd try to tell him, but kids these days think they know everything."

"He was very quiet, didn't talk much."

The teen didn't live with his mother because they were having "problems," the grandfather added.

On Tuesday, he was outside the house when the teenager opened fire. A neighbor called him to tell him his wife had been shot, but when he returned to the house, Ramos had escaped in his grandmother's car.

"The neighbor called me and told me she had been shot. When I came here she said he had taken away. It still hasn't sunk in," he said.

The Call of Duty-obsessed gunman bought two guns, including a Daniel Defense AR-15 worth $1,870. He posted a receipt for that purchase on the website Yubo, which The Daily Dot obtained Tuesday after the shooting.

It is unclear whether Ramos, who turned 18 last week, purchased both guns on the Daniel Defense website. The site is run out of Georgia and operates by allowing customers to place orders online and then pick them up from a local dealer. There are no Daniel Defense dealers listed in Uvalde, but several are 100 miles away in San Antonio, but the ATF confirmed on Tuesday that Ramos purchased at least one gun from a local firearms dealer.

His first purchase was on May 17 for an AR-15 rifle. The next day, he bought 375 rounds of 5.56 ammunition, according to ATF sources cited by Click2Houston.

On May 20, he purchased another rifle. One of the weapons was found inside the truck he crashed into a ditch Tuesday before opening fire at Robb Elementary School.

The Daniel Defense rifle was found inside the school, where police shot and killed Ramos. It is unclear how the teen paid for the weapons.