Yes, they are somewhat common. In the world of youth sports, there are a lot of interactions between parents, especially moms, and coaches. The power dynamic and the close proximity in these situations can sometimes lead to such situations.
Definitely not. We should respect others' dignity and privacy. Such stories often involve personal and private aspects of people's lives, and spreading them without permission is wrong.
There is 'Love on the Soccer Field' which also features a story around a soccer coach's daughter. The story is filled with the passion for soccer and the budding romance. The daughter, with her own dreams and aspirations, meets a guy who changes her perspective on love and life while being involved in the soccer world.
In the Coach Ken Carter true story, one key event was his implementation of a strict contract for his players. He demanded good grades and proper behavior. Another was when he locked the gym to enforce academic discipline. This sent a strong message about the importance of education.
One common theme is the clash between the world of soccer and personal relationships. The soccer coach's daughter is often caught between her love for someone and the demands of the soccer - centric environment she grew up in.
One scenario could be that the younger coach shows excessive attention to the soccer mom. For example, he might compliment her appearance often, like saying how nice she looks at the games. Another could be that he invites her to private events related to the team under false pretenses, gradually creating an environment where an improper relationship could develop.
First, don't believe it blindly. Then, if you are concerned about the situation, you could try to find out the facts in a proper and respectful way. But in any case, do not spread the story without knowing the truth. We should promote a positive and respectful social environment.
I don't know who Ken is specifically. The story he is telling could be about his personal experiences, like a trip he took, or it could be a fictional story he made up, perhaps a fantasy adventure with magical creatures.