Uncle: Ariel Castro, owner of home where 3 women were held captive, hid his dark side

Castro and his brothers, Pedro and Onil , arrested

CLEVELAND - Ariel Castro is a former school bus driver who loved playing with children, music and his bass guitar. He was also skilled at keeping a dark side hidden, said his uncle, who lived down the block from his nephew's home where three missing women fled for freedom on Monday night.

"Nobody in the neighborhood or in the family could imagine that something like this would happen," the uncle, Julio Castro, told ABC News. The uncle said he had no indication three women were living inside the modest two-story home Ariel Castro has owned since 1992.

Juan Alicea, another relative of Castro, said the suspect was intensely private and kept his social life outside of his home.

"He'd never have anyone come over," Alicea told ABC News. "He'd never had [a] social life, unless they were outside on the porch or something, as far as I know."

Police say Ariel Castro, 52, and his two brothers -- Pedro Castro, 54, and Onil Castro, 50 -- have been arrested in connection with the kidnapping of Michelle Knight, Amanda Berry and Gina DeJesus, who went missing while in their teens and early 20s.

Cleveland Deputy Police Chief Ed Tomba said at a Tuesday news conference charges would be filed within 36 hours of the three suspects' arrests. It was not immediately known what charges the men could face or what roles the brothers allegedly played in the crime.

-- Castro Had Little Contact With Police --

Ariel Castro was arrested in 1993 on a domestic violence charge that was later dropped, WEWS-TV reported. That same year, Castro pleaded guilty to disorderly conduct.

Police said they combed through records and found they had been called to Castro's home in March 2000, years before any of the women were abducted, after a fight was reported on the street.

After Berry and Knight disappeared, Castro had one unrelated brush with police, in January 2004. Police came to the home to talk with Castro after he "inadvertently" left a child on a school bus while working as a driver for the Cleveland Municipal School District, Tomba said.

Castro was interviewed, Tomba said, and after authorities realized there was no criminal intent, the case was closed. Other than minor traffic infractions, it was the last contact police would have with Castro until his arrest on Monday.

Neighbors describe Ariel Castro a friendly man who'd easily blended into the community -- dropping in for a backyard party or barbeque, playing with dogs in the yard and tinkering with his cars and motorcycles.

--Neighbors ask if they missed red flags--

But looking back, relatives and neighbors wonder if they missed red flags.

Julio Castro said the alleged crime had brought "shame" to his family, as he struggled to understand how his nephew kept his dark side concealed from other family and neighbors.

"Apparently he was living two personalities," Julio Castro told ABC News. The uncle said the persona he saw was "the personality that was dealing with kids and driving the bus, the personality of being a musician and playing the bass."

Juan Perez grew up two houses down from Castro's Seymour Avenue home.

"I'm not the only one on the block that feels ashamed to know that we didn't notice anything. I mean, I feel like my head's low, I work at a school, I work with kids, my head's -- I have a heavy heart right now,” Perez told WEWS-TV.

Perez described Ariel Castro as an easy-going man, known to nearly everyone on the block.

"He was a nice guy. He would come around and say hi. He gave the kids rides up and down the street on his four-wheeler," Perez said. "I’ve known him since I was like five or six years old myself. He would ask me if I wanted a ride…He seemed like he was a good guy to the kids that were here. I don't think he had any bad (attention) with the kids that were on the block but it just. I didn’t think anything of it,” Perez said.

Thinking back on the suspect’s behavior, Perez said, “Now it's like, red flag, red flag, red flag. Somebody should've said something."

"My sister actually a few years ago heard a scream and she called police," Perez told WEWS-TV. But he said they had no idea where the scream came from.

"We got to start being you know, close-knit, really close-knit because this can't happen, this really can't happen, you know, this is bogus,” Perez said.

--Castro's adult children have strange ties to violent crime, missing women--

One of Ariel Castro's adult children is in prison for a horrific crime and the other wrote about one of the missing Cleveland teens as a college journalism student.

Castro's daughter is serving 25 years in an Indiana prison for slashing her 11-month-old daughter's throat. A judge found Emily Castro both guilty of attempted murder but also mentally ill in 2008, according to the Fort Wayne Journal Gazette.

Meanwhile, Ariel Castro's son, Ariel "Anthony" Castro, wrote an article about the disappearance of Gina DeJesus in 2004, when she vanished while walking home from school.

"This is beyond comprehension. ... I'm truly stunned right now," Anthony Castro, 31, told WKYC-TV. The younger Castro said he was a journalism student at Bowling Green State University when he wrote the article for the Plain Press in Cleveland.