After Cursory examination of Nevada law as well as checking the gun law maps both here on opencarry.org and the Brady Campaigns website, I can find no laws regarding private sales in Nevada. Federal law allows for the gifting of handguns if both parties reside in the same state. (18.44 USC)
As long as both you and your pa live in the State of Nevada there is no need to transfer a firearm through an FFL and you will pay no fees.
Bills of sale are technically optional. and in the case that your father is the original purchaser of the guns and that fact you know him personally you'll probably be fine without one. If you were buying/selling from someone you don't know I'd recommend asking to see the other party's ID and fill out a bill of sale, but in your case you'll probably be fine.
If you and your father reside in different states, you can either A) have your father bring the pistols to your state and transfer them with a form 4473 and background check at a licensed gun shop (FFL holder) or B) your father may ship them from an FFL in his state to one in your state. in such a case any fees paid are up the gun dealer.
I have dealt in third party sales for firearms before in Washington State.
*nothing above constitutes legal advice and I am not an attorney