Mother-in-law sent us money for purchasing a new vehicle, $20,000 total payment. We where just notified about the 8300 form. Does she fill the form out or do we?

our mother-in-law received money from a settlement. My name is on the title for insurance purposes only. my wife does not work and I am the sole provider for the household. Does this affect my 2017 taxes since the car was purchased 1/2017?