The rear doors in my car can't open from the inside for the kid's safety. I always check the mirror on the passenger side and will ask my passenger to wait when

The rear doors in my car can't open from the inside for the kid's safety. I always check the mirror on the passenger side and will ask my passenger to wait when necessary. My mother-in-law is notorious for throwing the door open wide without looking (often hitting parked cars). She can't be taught so I just put her on the back seat now. I live in an area where the parking spots are on the left side of the road. I don't know how common it is for Dutch people to check the mirror for the passengers door. Maybe it just depends on your mother-in-law.