It depends on how you count: 1 unborn, 1 miscarriage, 2 legal adults still here, and 10 others. That could add up to 10, 11, 12, 13, or 14. All are from the same mother.
Car seats go in rows 2 and 3, since those are easiest to reach from the side door. It helps that our state hasn't totally caved to the car seat industry lobbying.