Because you hate your grandmother snake, that dream may have something to do with her.
Three snakes, a small one and a big one.
This big pair represents the elders you don't like.
Younger people are relatives and friends who are similar to or younger than you.
When the younger one enters your house, it shows that the younger one is self-righteous and makes friends with you.
In fact, you don't like her.
You want a quiet life and don't want to be with annoying people.
So the closed door is not only your door, but also a symbol of your heart.