I remember my mother and my grandmother had many Mystical Jewish Beliefs if I can term them that way. For instance if a house Fly was to get into the house it was a dead relative bearing news that everything upcoming will be alright.
I recall when My grandmother saw two birds perched upon her window sill one was a fat bird & the other a thin bird the day before her surgery She. went on to say that the fat one was her husband (my Grandfather) and the thin one was her mother (my great grandmother) had come from the after world to let her know that everything will be alright.
My mother would often say that when Fly was in the house that is that my deceased father so don’t kill it. As strange as this sounds this was the central Jewish Belief over a 1/4 century ago .I honestly doubt that it is tought today.