Fort Lauderdale, Florida (CNN) -- Just taking a sip of water or walking to the bathroom is excruciatingly painful for 15-year-old Michael Brewer, who was burned over 65 percent of his body after being set on fire, allegedly by a group of teenagers.



"It hurts my heart to see him in pain, but it enlightens at the same time to know my son is strong enough to make it through on a daily basis," his mother, Valerie Brewer, told CNN on Wednesday.



Brewer and her husband, Michael Brewer, Sr., spoke to CNN's Tony Harris, a day after a 13-year-old boy who witnessed last month's attack publicly read a written statement:



"I want to express my deepest sympathy to Mikey and his family," Jeremy Jarvis said. "I will pray for Mikey to grow stronger every day and for Mikey's speedy recovery."



Jarvis' older brother has been charged in the October 12 attack in Deerfield Beach, Florida.



When asked about the teen's statement, Valerie Brewer -- who knows the Jarvis family -- said she "can't focus on that."



"I would really like to stay away from that because that brings negative energy to me and I don't need that right now," she said.



Her son remains in guarded condition at the University of Miami's Jackson Memorial Hospital Burn Center. He suffered second- and third-degree burns over about two-thirds of his body, according to the hospital's associate director, Dr. Carl Schulman.



The teen faces a lifelong recovery from his injuries, Schulman told CNN's Harris.



"Michael's still got a lot of major surgery ahead of him, a lot of rehabilitation and therapy," Schulman said. "He's doing about as well as could be expected at this point in his recovery, but he's got a period of probably several weeks to a couple of months still left in the hospital if everything goes well, but the recovery is lifelong. This is truly a life-changing event."



Valerie Brewer said her son's treatment is excruciating at times. Physical therapy, she said, is "incredibly painful. He almost cries because it's so painful. He's burned badly on the backs of his knees and every time he moves his knee, it pulls, and if it's healing, it pulls the scab and it cracks, and it starts to bleed."



The boy must undergo hour-and-a-half showers, she said, where "they take a piece of gauze, and they wipe off all the dead skin. They give him painkillers for that, but it's incredibly painful and it breaks my heart every time they have to do it. ... That's what we call the torture hour."



Heavy metal musician Ozzy Osbourne sent Brewer a CD, and he plays it on a boom box during the showers, she said. "He focuses on Ozzy, and he gets through his torture hour."



Police were able to interview Brewer on Monday for the first time since the incident. Hospital officials have said Brewer can communicate only in one- or two-word answers.



Valerie Brewer would not go into details about what her son told investigators, but said that "he answered the questions they asked."



The interview was emotional for both the teen and the investigators, according to Maria Schneider, a prosecutor with the state attorney's office in Broward County.



"It was difficult for him to talk about. Difficult for us to listen to," she said of the interview. "Just difficult all around, heart-wrenching. He's doing so much better, but it's such a terrible situation."



Denver Jarvis and Matthew Bent, both 15, are accused along with a third teen, Jesus Mendez, 16, of being in a group that poured alcohol over Brewer and set him ablaze in a dispute over $40, a video game and a bicycle. All three pleaded not guilty in an appearance last week in Broward County Circuit Court. If
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question: who set Michael Brewer  on fire?, answer: a group of teenagers. | question: whar singer does Michael Brewer listen to?, answer: Ozzy Osbourne | question: who has been charged, answer: Denver Jarvis | question: which cd did they use, answer: Ozzy Osbourne | question: how many youths are charged with thye attack?, answer: three | question: who was set on fire, answer: Michael Brewer, | question: what is used to help teen?, answer: Ozzy Osbourne | question: Have the teens charged pled guilty?, answer: All three pleaded not | question: What happens to 15-year old Michael Brewer?, answer: burned over 65 percent of his body after being set on fire, | question: What is he healing from?, answer: burned over 65 percent of his body | question: What teen uses to get through painful therapy?, answer: "He focuses on Ozzy, | question: Whose CD does the teen use during therapy?, answer: Ozzy Osbourne | question: How many attacked Michael Brewer?, answer: three | question: What is observation of mother of burned teen?, answer: "It hurts my heart to see him in pain, but it enlightens at the same time to know my son is strong enough to make it through on a daily basis,"