There is nothing wrong with this but there is also no way to prove that there are actually 6 of your family that uses 6 different accounts with the same IP. It could be only one person playing with 6 different accounts trying to abuse the free claim. Im not judging you but Im telling you that this could be a possibility that freebitco.in could come into if they recorded 6 different accounts collecting free claims in their site so those accounts could be banned

So it is best for you to avoid this or follow TheQuin's instruction, he replied to your question