On another note....if any of you want to search for family origin, these rituals can lead you to way....not all mong have this ritual...even within the same clan, some practice it and some do not. i know that hers and vangs do them...but i am not sure about other xeem. but not all vangs/her practice them either....and going back to searching for origins, the vangs who do it and my family (her) have been "neejtsa" for many many generations, going back to 1700s. I am sure this ritual began from a single village, spreading to those who are close to them...
even with the "caiv txaj," some practice it and some don't....so it seems, that these rituals originated within those people who lived in very close proximity or those who are very closely related.