Maybe she just has a limited repertoire of stories. Or perhaps those are her favorite stories and she wants to share them over and over again because they hold special meaning for her.
You could gently let him know that you've heard those stories before. Maybe say something like 'Honey, I love hearing about your experiences, but I've already heard this one a few times.' He might not even realize he's repeating himself.
Try to change the subject when she starts to tell the same story. For instance, if she begins, you can quickly say 'Mom, did you hear about this new thing that happened at school?' This will divert her attention and stop her from going into the familiar story. Another option is to introduce her to new stories. Maybe give her a book of short stories and ask her to read them so she has new material.
You should firmly but politely tell her that you don't want to hear such stories. For example, you could say 'Mom, these stories make me uncomfortable. Please don't tell them.'
Sometimes, when there are fewer new experiences in life, people tend to go back to the old ones. Your mom might not have a lot of new things to talk about, so she keeps repeating the same stories which are familiar and comforting to her.
It could be that she has dementia or early signs of memory loss. As people age, their memory can decline, and they might not realize they are repeating stories. Another reason could be that those stories are very important to her, and she wants to make sure you remember them. Or it might just be a habit she's developed over time without realizing it.
You could gently remind her that she has told you the story before. Maybe say something like 'Mom, I love that story, but you've told it a few times already.'
When I was preparing for an important exam, my mom made me follow a strict study schedule. She would check my progress regularly. I was a bit stressed, but she also motivated me by sharing stories of her own hard - working days in school. Her stories inspired me to keep going, and I ended up doing well on the exam. Through this, I learned that discipline and motivation from parents can be really helpful in academic achievements.