My dad and his wife have a (will be 5 at the time of the wedding) year old. Its all complicated but not the time to rant and rave; but I have recently accepted that she is my half sister and I should care about her. But my problem is that my FI do not want anyone under 18 at our wedding. We are OK with having her as the one exception only because she is my sister. But we absolutely do not want her at the reception. Dad and his wife are invited to the reception. They live at least 45 minutes away and would not reasonably be able to take her home. Any ideas for a solution to my problem? Thanks