Grandmas Banana Pudding

2 boxes instant banana pudding
8 bananas
1 box vanilla wafers
sm tub sour cream
1 tub cool whip you will use 1/2 the tub
Mix the pudding using 1-1/2 cups milk per box
once thick add 3 heaping tablespoons sour cream and 1/2 tub cool whip, fold it in. Mix it gently by hand. Next layer cookies, bananas and mixture then repeat til gone. Keep the left over cookies in the bag and crush them up to sprinkle on top.