It stands for family harmony. Usually, if the atmosphere of a family is gloomy and family members often quarrel, the atmosphere of this family will naturally not easily let birds fly in. So usually, if a family has birds flying in, it actually means that the family is relatively harmonious, so the birds have not found a bad smell.
3. it means that wealth is coming again and again. In a family, if a bird flies in, it actually means that the family is about to have a fortune. Because many times birds can be auspicious animals, if they fly to your home at this time, it actually means that they have brought wealth to your home. Of course, it's up to you to make good use of them.