My father passed away 2 weeks ago and there is a stepdaughter living on the property and is saying there is no will what do I do

I'm sorry for your loss.  I recommend petitioning  the probate court for the county where your father lived to seek appointment as executor of his estate.  As part of the petition, you can state that you have not found a Will.  If you believe that there is one and the stepdaughter is not producing it, you can state that too and the court will require her to produce the Will if there is one.  Good luck.