A California mother and her 14-year-old son have been arrested after the son “accidentally” shot his toddler half-sister. Thirty-seven-year-old Veronica Pyatt, the teen, and Pyatt’s 20-month-old daughter were in a vehicle in San Bernardino Tuesday afternoon, San Bernardino police said. The teen was “manipulating a loaded firearm in the back seat” of the vehicle, police …