Baby shower invites

There is a couple of family members who I don't have their phone numbers or address to. My cousin invited them to the baby shower through Facebook and they haven't responded yet. We send out invitations to some and called some on the phone but now it's too late to send out more invitations because it's next weekend. Would it look bad if I message them and invite them myself? I'm not going to ask if their coming, but just making sure they got the invite.