I didn't do it!

This morning I heard Jon running up the stairs, yelling, "Mom, Mom, Mom!" and Michael was screaming at me "Whatever Jon says I did - I didn't do it!"

So my question is does that mean my middle child is learning how to make things up to get his big brother in trouble? Or does it mean my oldest is pestering his little brother so much he doesn't even know which of his transgressions will be tattled about?