Vacation Home With No Downpayment

[Andy Scola]

I have the opportunity to buy a vacation home from my grandfather @ 80% of it's appraised value. I realize that I still have to put 20% down as a down payment. However I don't want to put anything down. Can the seller (my grandfather) sell the home to me at 100% appraised value, giving me the 20% off, having me take at a mortgage for the remaining 80%? So in the lenders eyes I have 20% into it?

Is there a creative way to do this that a lender would be ok with?