Well, generally speaking, it's not normal at all. It's a very strange and inappropriate act. Our society has certain norms about appropriate physical contact, and this clearly goes beyond what is acceptable. People usually keep a respectful distance from others' feet as they are often seen as dirty and private parts of the body.
Since there's no common knowledge about a story named exactly like that, it might be a very private or unique story created by someone. Maybe it's about an experience related to the feet, perhaps a strange or funny encounter involving the area between the toes, but without more context, it's hard to say for sure.
These are surely fictional. In a normal family relationship, there are appropriate boundaries and behaviors. A mother's relationship with her child is based on love, care, and proper nurturing, not on such abnormal and inappropriate actions.
It's not straightforward to tell if 'Toes' is realistic fiction. Maybe it has a basis in reality but with some creative embellishments. Or it could be purely fictional with no real-world parallels. A closer examination of the plot and characters would provide a clearer answer.
Some people might make up such stories to shock others or get attention. They know that it is abnormal and inappropriate, and by spreading such content, they try to create a stir.
One scary story could be that in a dark forest, there was a giant's footprint. And in the middle of that footprint was a giant's toe as big as a boulder. Legends said that if you touched it at midnight, a curse would befall you, and you'd be haunted by the giant's ghost for the rest of your life.
A few of my friends are big fans of hiking. They love exploring nature trails, seeing the beautiful scenery and challenging themselves physically. They often come back with amazing stories about their hikes.
Many friends like sports. For example, my friend Lucy loves playing tennis. It keeps her fit and she also makes a lot of new friends at the tennis club.