How do you know if you have a fairy family?

I have the characteristics of a fairy family:

If people are possessed by the fairy family, they will feel extremely tired and do have all kinds of discomfort. They do things they don't usually do, like food they don't usually eat, like dark places, be alone, and sometimes have the idea of self-abuse.

The fairy on the body mainly depends on whether the index finger of the man's left hand is gray or black; Women mainly look at whether the right index finger is black or gray, and move it from time to time.