My PIL live about a mile to us and have a key to our home, which in my opinion is for emergencies. We were heading out last night at 7 and MIL was kindly going to babysit. At 6 my husband and I were in the kitchen and heard a key being turned in the front door, and there was MIL saying 'I brought my own keys'. I was fuming, gave her the flared nostrils and said 'you should have knocked, we could have been doing anything!'. I had to scarper upstairs in order to cool down about this, and am still really cross that she thought it was ok just to open our front door without knocking or ringing the doorbell, and we were clearly at home.
She has in the past let herself in to our house whilst we've been away on hols and done some of our washing and ironing without asking, and of course I know that she's only being kind then, but have felt uncomfortable about this too. Although haven't mentioned it.
Am I way over protective about my personal space?