My dsis phoned and asked me if I wanted to go to Costco tomorrow (she is a member) if our parents could look after dc (mine, she is currently 6 months pregnant). I said yes if parents could babysit as both of our dhs are working tomorrow. She then said do you know where it is and I said yes then realised what she actually wanted was me to drive her there! She has a car and can drive. She said this thinking she was doing ME a favour! Aibu to think she is at it and should drive and not assume I want to squire her about?