Two teenage boys have been charged with murdering a dad who was stabbed to death after his car was rammed off the road - and conspiring to murder his son. Kelvin Ward, 50, was knifed in his car on Chester Road, in Castle Bromwich, Birmingham on April 18. He had been travelling in a car which was ploughed into by another vehicle before he was knifed by a gang of thugs who then fled the scene. Leighton Williams, 28, from Stechford, Birmingham, has already been charged with murder alongside a 16-year-old boy. West Midlands Police said today (Thurs) two 17-year-old boys had now also been charged with murder and conspiracy to murder Mr Ward's son. One of the boys has been remanded into youth detention while the second will appear at Birmingham Magistrates Court this morning,. A force spokesperson said: "The family of Mr Ward have been made aware of the recent update and our thoughts remain with them. "We continue to appeal for anyone with information which could assist our investigation to come forward." Tributes were paid to Mr Ward by his family, who described him as a "loving partner, father, son, brother and friend to many." They said in a statement: "We would like to thank everyone for their loving messages and support at this very sad time. "Kelvin was a loving partner, father, son, brother and friend to many. He was very well loved, vibrant, full of life and will be greatly missed.” Photographs taken at the time show how a black Ford Fiesta was let damaged after crashing into railings near a pedestrian crossing. A red Ford Focus, a black Vauxhall Corsa and a Jeep were also spotted abandoned near the scene. An 18-year-old man remains on police bail as enquiries continue and police are still urging any witnesses or those with information to get in touch. The force can be contacted via Live Chat online, or by calling 101, and quoting log 4840 of April 18. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.