Insanity

On a normal day, this house contains my wife, myself, two dogs, two cats, and some fish. A "peaceful, easy feeling" generally pervades.
By tomorrow night there will be my wife, myself, two dogs, two cats, some fish, my daughter and son-in-law, their daughter, my son's daughter, and my other daughter's four kids.
All of the above mentioned grandchildren are under the age of five.
I'm afraid I may go mad.