My wife and I are travelling DTW-PDX on separate reservations, same flights. She is carrying a small dog in a fabric carrier and has paid the extra fee to do so. She is therefore not eligible for an exit row. NW tells me that US law states that no member of a family travelling on the same flight may sit in an exit row if ANY member of the family on the same flight is ineligible for an exit row.Separate reservations notwithstanding. Anyone know whether this is true?