The suspect involved in the fatal shootings of three people outside a Philadelphia-area suburb on Saturday morning has been arrested.According to authorities, 26-year-old Andre Gordon was found near a house in Trenton, New Jersey, where he was believed to have barricaded himself after two separate shootings in Falls Township, Buck county, the Associated Press reports.Gordon is suspected of killing his 52-year-old stepmother, Karen Gordon, his 13-year-old sister Kera Gordon and the mother of his children, 25-year-old Taylor Daniel, the Bucks county district attorney, Jennifer Schorn,…