Answer:
We are five little objects of an everyday sort. You will find us all in a tennis court.
Some try to hide, some try to cheat. But time will show, we always will meet. Try as you might, to guess my name. I promise you'll know, when you I do claim.
You use a knife to slice my head. And weep beside me when I am dead.
The eight of us move forth and back. To protect our king from the foes attack.
Autumn leaves and bad bowlers wreak havoc on this
I am your mother's brother's only brother in law. Who am I?