mommyMom automatically gets shotgun, period. If you make your mom sit in the back seat, you are an evil person.

3.1.1 The oldest generation mother to the driver has first rights to Shotgun.
Example: Great Grandma of the driver, gets Shotgun before Grandma.

3.1.2 The driver’s mother gets shotgun, followed by the next alternate passenger’s mother.

3.1.3 In the case that the driver may have two mothers of the same generation along for the ride, they must call shotgun, but only they are eligible passengers to call Shotgun.