It could be that the son's friends took advantage of the mom in terms of money. For example, they might have borrowed money from her and never paid it back. Or they took advantage of her hospitality. They visited often and ate her food but never showed any gratitude or respect. They might also have made the mom do a lot of work for them, like cleaning up after them when they made a mess at her place, thinking that she was just there to serve them because she was the mother of their friend.
Perhaps the son's friends exploited the mom's kindness, like asking for too many favors or using her resources without permission.
One 'took advantage of mom story' could be about a kid who took advantage of mom's kindness. For example, the kid knew mom would always make his favorite meal when he pretended to be sick. So one day, just to have that meal, he faked being ill. Mom, being the caring person she is, made the meal, and later found out the truth.
There could be several reasons. One possibility is that they are in some kind of trouble themselves and think blackmailing the mom can solve their problems. For example, they might have debts they need to pay off. Another reason could be that they are just bad - natured kids. They might enjoy having power over someone and see blackmail as a way to get that power. Or perhaps they have some secrets that they don't want the son to know and they are using blackmail to keep the mom quiet about those secrets.
The son can directly confront his friends and tell them to stop taking advantage of his mom.
One lesson is about honesty. In a 'took advantage of mom story', often the person taking advantage is being dishonest. We should always be honest with our moms. For example, if we pretend to be sick just for perks, it's wrong.
She should immediately contact the police. The police are trained to handle such situations and can protect her and her family from further harm.
It's possible that the son was influenced in some way. He might have seen different values or lifestyles among his friends. If his friends were very studious, he could be inspired to study harder. After visiting, he might start to change his daily routine or hobbies based on what he experienced there.
I'm not sure specifically what this 'mom taken at son's party' story is about without more details. It could be that the mom was suddenly called away during the party, or perhaps she got involved in an unexpected situation at the party.
It could be that the son's friends, perhaps through peer pressure or some kind of mischievous idea, try to get the son to do something that involves his mom in an unexpected way. For example, they might dare the son to invite his mom to a very uncool event for her like a skateboarding competition among kids and then try to make her participate in some way.
The main characters are obviously the mom and the son's friends. The mom could be a kind - hearted and friendly woman. The son's friends could be a diverse group of kids, each with their own personalities, like one might be the joker of the group, another could be really studious.
First, you should firmly tell your son about what his friend has done. Then, depending on the nature of being 'taken advantage of', if it's a financial matter, you may consider asking for compensation or taking legal action. If it's an emotional or personal matter, make sure to set clear boundaries and keep your distance from his friend.