I am sending out invitations for my friend's shower this week. On her guest list she has many people that share addresses. Three of her sisters and her mother, for example, but there are a few other friends/family members that this applies to. Should they each get their own invitation, or can I group each address together as one - what would be proper? I've already ordered the invitations, and have enough to give one to each person, so that's not the issue. Thanks!