No, it is completely inappropriate. Incestuous and sexual content involving family members is not acceptable in society and goes against moral and ethical norms.
One way is through education. Schools and families should teach about appropriate values and ethics. When people are aware of what is right and wrong, they are less likely to spread such inappropriate content.
Perhaps they go to the drive - in as part of a family tradition. The mom tells the son stories about when she used to go to the drive - in when she was a kid. They sit in the car, with the cool night air coming in through the windows, and enjoy the movie while reminiscing and creating new memories.
Well, generally speaking, it's not proper. We should uphold certain social and family norms. Mom and son are family members, but this kind of overly intimate physical contact like sitting on the lap might make both of them feel uncomfortable in a way, and it also doesn't conform to the common sense of propriety in family relationships. There could be other options like sharing a seat cushion or rearranging the seating in the vehicle to make the long drive more comfortable without this kind of inappropriate behavior.
One interesting story is about a family who brought their dog to the drive - in theater by mistake. The dog got really excited when the movie started, barking at every loud noise. But instead of getting annoyed, the people around them found it hilarious and it ended up being a fun addition to the movie - watching experience.
This is completely inappropriate behavior. There should be clear boundaries between a mother and a son. Discussing sexual stories is not suitable in a parent - child relationship. It violates the norms of healthy family relationships and can cause great harm to the son's psychological and emotional development.
I'm not sure specifically what the 'drive in mom story' is without more context. It could be a story about a mom's experience at a drive - in, like a movie drive - in where she has an adventure, meets some interesting people or has a special family moment.
No, it is not appropriate. Sex education for children should be carried out by professional educators or in an appropriate educational setting. A mother teaching her son about sex in a story - like way can create an uncomfortable and inappropriate family dynamic.
In some cases, it can be appropriate. If they are in a situation where there are no other options due to space constraints and it's a family - only environment, it may be okay. For example, if they are in a small camper van and all the seats are occupied with necessary items.
They can listen to the radio. Drive - ins often have a radio station that plays music or provides information about the movies. So, they can tune in and listen to some old - timey tunes or learn some fun facts about the movies being shown.