Idiom - Pot calling the kettle black - What it means?

It was well past ten on a cold September night, i was all alone on the first floor of the three storied well compounded house of my in law down in suburbs I was not alone in the house though my sister was completing her last minute errands and the cleaning is pending.   we both finished our dinner a bit early that day and since I was on a holiday I normally rest most of the time there was only one television on the ground floor the house is the last in the deserted street opposite to that lane there was an almost empty ground a dilapidated stadium building which was half way constructed and left off some decade back because of some ligation on the property. The house we lived in was itself two decades old but only the ground floor was constructed the first and the second floors were raised later as we settled.


The house is big with two huge gates for the car to enter its an old Am
I usually occupy the room on the ground floor to sleep at night it had a single cot with hard mattress, an old cupboard white in color; since it was previously used as a store, the room is dull with old paint removed here and there; there were crow bars, some old portraits and few out of size kitchen utensils placed in the corner of the room. I heard my in laws' great grandfathers some decades back were hoteliers so most of the kitchen and store cupboards are huge. The kitchen



 I came to the guest room on the first floor as my sister is alone usually until she is sleepy she would come to the guest room we would chat for few hpure untill both of us are tired and cannot withstand sleep.