I work part time for a publishing company and there are six of us on my team. Two of us have young children and the other Mum is constantly saying she can't do this and she can't do that because she has kids. I remember, before I had dc, how annoyed I used to get when working mums assumed I had no life outside work and should always be available to provide early morning or late evening cover, travel miles to a meeting or cover the Christmas/New Year holiday. I therefore am paranoid about not doing this to my colleagues now and making sure I pull my weight as much as possible and remember to thank people if they do oblige in some way. This colleague really treats people without children as people without lives and just assumes they will fit in with her circumstances all the time. I'm starting to feel a growing resentment in the team and once or twice pointed remarks have been made about 'working mothers'. I feel I'm being tarred with the same brush as her. AIBU to wish she'd stop doing this and be a bit more considerate and professional?