I find that if I send an invite to someone and they download & create an account at that moment, it doesn't give them the "become a fan" option. I have to remove the invitee on my end after they've downloaded app / account creation in order to send the request and have them get it in their inbox. Also, when clicking "accept" the first time, it always gives an "network error" message. After this point, I can still see the invite notification, click on it, then it will add the kids to the other persons account.