FI's cousin just gave birth to twin baby girls in late December, and will most likely be bringing them to the wedding, and I'm not sure what to do for seating arrangements for the two of them. They are teeny, since they were premies, and I'm not sure they will be sitting up in a high chair by the end of April. Is it my responsibility to provide them with a high chair, or is it the parent's responsibility to deal with it? FI says that its their responsibility, we aren't providing diapers for them, and that they'll probably be held by most of the guests anyways, since it will be the first time most of the family has seen them since they were born, so most likely the high chairs wouldn't even be used much. Opinions?