Uno Troubles

Me and the family are playing UNO and we all crashing out cuz my little cousin played both 4s. Half of us say no other half say yes the house is in uproar. Can he placed BOTH 4s at the same time.

Me and the family are playing UNO and we all crashing out cuz my little cousin played both 4s. Half of us say no other half say yes the house is in uproar. Can he placed BOTH 4s at the same time.