$60,000 in one check with only my dad's name, but can we say it is from my mom and dad to me and my wife?

If my dad borrows from bank of $60,000 and gives me the check. I deposit the check into me and my wife's joint bank account. I know my dad can avoid gift tax of $30,000 for married couple. Can we say other $30,000 from my mom? We will write a letter stating this fact and have it notarized! 

Also, this will be for 2018 tax return, so the gift tax exclusion is now $15,000 per individual, just to clarify.