oh wow...I just went through the same thing with my mum. She just recently had surgery and I was left home to house sit...feed all my animals and make sure the house was absolutly perfect when she got home....I even cleaned her room and my sisters room. I re-arranged the living room etc.....and well...my guess is that she must have been tooo tired to notice. oh well...but we do it to be kind, trust...they know.