Let me try to illustrate.
You sign over a check for half of $433,000 to your father. Despite the fact that you never deposit this cash, it's still yours, so you have given a gift of $216,500 to your father.
Your father decides to give you $100,000. It's debatable whether this is actually a different transaction if it happens quickly (but doesn't it make more sense to cash the check and give your father $116,500?). Anyway - the net result is probably a gift from you to your father of $116,500.
Or perhaps a gift from you to your father of $216,500 and then a gift from your father to you of $100,000 just so that the entire family can file gift tax returns?
Anyway - take your $100,000. Take it up front. Why would you even consider relying on your father to pay you $15,000 for the next who knows how long? My personal preference is if you cash your check and take your $100,000 up front. Why wouldn't you do that?
To be honest, this whole scenario makes me want to put my head in an oven. Maybe you should hire a CPA?