My mum lives about 15 minutes away and I see her regularly. She phoned today and asked if she could come round and I said yes after swimming. She came just as I was putting DS down for his nap so we came downstairs, said hello etc then I took him back upstairs to put him to sleep. I came back down after 5-10 minutes max and my mum said "do you not have any windows open in this house". I explained I had been out and the house was nice and cool anyway. I will open the windows later to let the cooler evening air in but for now they were shut, bar the bathroom window. For relevance downstairs we only have the kitchen window which opens directly onto the road and the patio doors in the lounge. My mum then said she was hot so I asked why she hadn't just said that and opened the patio doors, although there is no breeze. She then said I should have DS window open as it would help him sleep better but I explained that his room looks over the road and the trainline and the noise would wake him. She then said "I just don't understand you' and stormed out. She had only been here for 15 minutes. Did I commit some huge mistake by not having all the windows open?