Answer:
We are five little objects of an everyday sort, You will find us all in a tennis court.
Steals an event or even a mood. Reveals the truth or shatters it.
You can only have it once you have given it.
It's anything but amusing when this body part gets hit.
I have it, I donβt share it. If I share it, I donβt have it. What is it?
I am your mother's brother's only brother in law. Who am I?