Apology letter:Dear sir,
I heard from my son that today morning our cat ate up one of your chickens. This is in fact unfortunate and I apologies sincerely for the life caused. Our cat is usually well behaved and I cannot imagine what got into her. This morning, Moti has been properly punished and I am sure it will not bother your chickens again. I have asked my children to keep an eye on Moti and see to it does not cause you again your any inconvenience or damage in future.
I am sorry for what has happened.