If your credit is good, you may not need to put anything down. Most times you can roll everything into the mortgage (including closing costs). Having said that, it's not always the best plan. Your payment will be higher and you will need to pay Mortgage Insurance until you have 80% Loan to Value in the house. (That means that you're principle on the Mortgage is less than 80% of the the value of the house).
You will be very happy with the tax benefits also... It turns out to be a lotta dough, especially in the early years of the mortgage, when you are paying a lot of interest.
Good luck, it sounds like you have a good team of family memebers to go to for advice. :thumbup: