Maybe say your mum really wants to do it and you want to help her as you need a distraction or a little project at the moment? Something like you are bored you need it to keep busy? Or your mum is feeling a little left out of the pregnancy so you think it would be nice for her to do this for you? And I would just say out there that you dont want it to be a traditional shower you want partners etc why should it just be for women? Just some suggestions! Good Luck x