A 60-year-old man and his grandson were electrocuted at Wadala in central Mumbai today as incessant rains continued to lash the city.Ranjit Kumar Gupta (60) and Gaurav Karnik (5) were killed after coming in contact with live wire in a building at Wadala's J K Bashir Road, the Municipal Corporation of Greater Mumbai (MCGM) said in a statement issued here.