My parents are going to visit my brother, sil and 14 month old nephew next month. My SIL told them they have to get the whooping cough vaccine and the flu shot before they can visit with them. My parents aren't staying with them, they're staying at a hotel but they obviously will be spending time with them.

Do you require people who will be around your lo to get their flu shot/whooping cough vaccine? How old will your lo be when you don't worry about that as much?