I politely asked Gavin to walk upstairs and "tell you brother to please hold it down because the baby is trying to sleep."
"No mom!" Gavin said.
"Please Gavin just tip toe up and close his door and ask him nicely please hoot and holler not so loud. The baby is trying to sleep. If you say it nicely he will listen."
Gavin stood up and looked at me, rolled his eyes, and said: " How about just "Shut Up and Be Quiet!"
That is brotherly love!