Five members of a family were killed and one is battling for life after two groups clashed in Uttar Pradesh today over a long-standing property dispute, officials have said. A village strongman, Prem Yadav, and Satyaprakash Dubey in the Deoria district had been locked in a property dispute for a long time. Officials said that Prem Yadav had gone to Satyaprakash Dubey's early this morning for a discussion to end their rivalry.