I expressed in front of all sorts of people - parents, parents in law, my friends, partner's friends, brother and brother in law!! Didn't have an older child then, but next time round I would have no problems expressing in front of my dd. I did feel a bit embarassed in front of adults ... am kind of mortified about it now I think of it, but at the time I just needed to fit in my evening expressing to top up the supplies in my freezer for when dd was at nursery, so I just got on with it.