Police say the man, from Manchester, is believed to have known the victims. Police were called by North West Ambulance Service colleagues around 9:30 p.m. Thursday after the home incident at Miles Platting. The 15-year-old boy was treated at the scene for stab wounds before being taken to hospital where he died about an hour later, the force said. Police said his mother, in her 40s, was treated at the scene for serious stab wounds and is now in stable condition in hospital. DCI Alicia Smith said: “Last night’s attack left a community in turmoil and a family reconciled to what was a devastating event for everyone involved. “A teenager who had his whole life in front of him tragically lost his life and not only is his mother mourning the loss of her son, but he is also recovering from what would undoubtedly be terribly traumatic. “Our thoughts remain with the family for a long time and we are absolutely committed to determining what exactly happened last night. “Detectives have been working around the clock since this incident was first reported to us and we have now made an arrest, which is a huge step forward for the family to get the answers they need. “Our investigations are ongoing and we would like to hear from anyone who has information or anyone who may have seen anything. Report it online or via LiveChat at www.gmp.police.uk or alternatively, contact Crimestoppers anonymously at 0800 555 111. “