[Read our latest coverage of the fatal fire in Colts Neck, N.J.] 
 
 Two adults and two children were found dead on Tuesday after a possible arson fire engulfed a large, stately home in central New Jersey — hours after another fire erupted at a house owned by a relative, officials said. 
 
 Officials are investigating both blazes to determine if they are linked, the Monmouth County prosecutor, Christopher J. Gramiccioni, said at a news conference. 
 
 “That remains to be seen,” he said, “but that is an option or an angle we continue to pursue.” 
 
 The deadly fire that broke out in Colts Neck, N.J., around lunchtime and continued to burn into the evening was being investigated as a possible arson, Mr. Gramiccioni said. 
 
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 Mr. Gramiccioni said three of the bodies were found inside the home in Colts Neck, roughly 50 miles southwest of New York City. The fourth, a man, was found dead outside the burning house. Officials have not released the names of the victims. ||||| UPDATE: Colts Neck fatal fire mystery deepens as brother is charged with setting his own house ablaze 
 
 Keith Caneiro grew up in Brooklyn and was the best man in his brother's wedding. 
 
 Caneiro, whom a source says was found dead outside his Colts Neck mansion on Tuesday, was the owner of a technology firm and a pest control company in Asbury Park, according to public records and social media. He also dabbled in real estate. 
 
 Caneiro, 50, his wife Jennifer Caneiro, 45, and two of their children died in an apparent quadruple homicide at the family's sprawling estate on Willow Brook Road, discovered after a fire swept through the home, a law enforcement source told NJ Advance Media 
 
 The source said that Keith Caneiro, who was found on the home's front lawn, had suffered a gunshot wound that did not appear to be self-inflicted. 
 
 Keith Caneiro is listed as the owner of both the technology firm, Square One, and EcoStar Pest Management in Asbury Park, working both businesses with his brother. 
 
 He had operated Square One, in Asbury Park since 1987, according to his LinkedIn profile. 
 
 Records show Caneiro also has an active real estate license. A professional real estate website registered with his name as the web address advertises an affiliation with Keller Williams Realty. 
 
 Jennifer Caneiro grew up on Staten Island as Jennifer Karidis, her maiden name, records show. 
 
 Photos of the Caneiros on Facebook show a happy family playing in the kitchen, relaxing with loved ones and enjoying trips overseas. 
 
 Caneiro's brother, Paul Caneiro, of Ocean Township, is involved in both the technology firm and the pest control operation, according to Jared DeVincenzo, who works in the building which houses both businesses. The pair grew up in Brooklyn before both marrying women from Staten Island and moving to New Jersey. 
 
 Paul Caneiro's home on Tilton Drive was also the scene of a fire Tuesday morning, one that is now also under investigation by the prosecutor's office for possible links to the Colts Neck fire. 
 
 Whether the two fires are related "remains to be seen," Gramiccioni told reporters. 
 
 Neighbors told NJ Advance Media Paul Caneiro appeared visibly distressed, with "tears in his eyes," after the fire broke out before dawn at his house. 
 
 Neighbors said he stayed at the scene until about noon. He and his wife had not returned home as of Tuesday evening. 
 
 Neighbors described the Ocean Township couple, who have two older children, as friendly and helpful, and said Paul Caneiro had been injured in a car accident in Asbury Park a few years ago. 
 
 When Paul Caneiro married his wife Susan in 1991, his brother Keith served as his best man, in a wedding officiated by the mayor of Shrewsbury, according to the couple's wedding announcement in the Staten Island Advance. 
 
 Keith Caneiro's LinkedIn profile says he graduated from Columbia University with a bachelor's degree in 2014, and was either enrolled or recently completed a master's program at the university. 
 
 Both his LinkedIn profile and Facebook page also indicate he had taken courses at Harvard Business School. 
 
 He graduated from John Dewey High School in Gravesend, Brooklyn. 
 
 Caneiro purchased the family's home on Willow Brook Road in 1999, according to Monmouth County property records. He and his wife paid off the $1.8 million mortgage two years ago. 
 
 Prosecutor's office officials indicate they expect to release more information Wednesday. 
 
 Sophie Nieto-Munoz contributed to this report. 
 
 Thomas Moriarty may be reached at tmoriarty@njadvancemedia.com. Follow him on Twitter at @ThomasDMoriarty. Find NJ.com on Facebook. 
 
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– A convoluted story out of New Jersey, where police have charged Paul Caneiro with aggravated arson in connection with a fire at his own home—one that the Asbury Park Press reports occurred seven hours before a fatal fire at his brother's mansion. Around 5am Tuesday, firefighters responded to Paul Caneiro's Ocean Township home and put out flames on the roof. Around 12:30pm, fire broke out at brother Keith Caneiro's home 12 miles away in Colts Neck, where police say a quadruple homicide occurred: Keith Caneiro, 50—found on the front lawn with a gunshot wound that didn't appear to be self-inflicted, per NJ.com—died along with his wife, 45-year-old Jennifer Caneiro, and their son and daughter, who were found inside, a law enforcement source tells the Asbury Park Press. The New York Times describes both children as under the age of 10. The brothers appear to have been close. Born in Brooklyn, they shared a Staten Island address for more than a decade before moving to New Jersey with their wives, per NJ.com. They would take up separate abodes: Paul in a single-family home on Tilton Drive in suburban Ocean Township, Keith in a $1.5 million mansion in upscale Colts Neck, home to celebrities like Bruce Springsteen. But Paul would still work for Keith— owner of EcoStar Pest Management and apparent web development company Square One—who also served as his best man. "They're wonderful people," says a neighbor of Paul, who saw family members Tuesday outside the house believed to have suffered damage to its back and attic, per the Times. "It's pretty shocking stuff." An earlier version of this story erroneously reported Paul Caneiro as being charged in the Colts Neck fire. (More on the case here.)