My child was taken from my parents while I was incaresested and was he was given to his father who lives in Utah he filed for custody for him and my s

It is not so much a "change of venue" as moving to dismiss the action (that has to be done in Utah) and simultaneously moving to restore custody to you in las Vegas.  The two courts should hold a "UCCJEA conference" and if the facts are as they appear to be, the Nevada action should go forward and the Utah action should be dimsissed.  If you have questions, see "The Basics of Family Court Jurisdiction," which is posted here.  You really could use a consultation with a family law specialist well versed in interstate jurisdiction, however, and the sooner the better.