A father and his 19-year-old son have been arrested for the deaths of a pregnant Texas teen and her boyfriend. Christopher Preciado, 19, has been charged with capital murder for the shooting deaths of 18-year-old Savanah Soto and 22-year-old Matthew Guerra, WOAI reported. Preciado’s father, 53- year-old Ramon Preciado, was charged with abuse of a …