i would go and speak to the mother while u still have all the cuts and bruises from what her son and sons friends have done to you, also make sure you take photos yourself, so if it does go any further like to court you can show people what these kids have done, me and my family went through the same sort of thing like this a couple of years ago, it was very stressful and a living night mare, i hope you get it sorted out very soon,take care