In this case the daughter still has only a 50% chance of being colour defective. Blue colour blindness is far less common, being present in just 5% of all colour blindness sufferers. The genes affected are equal in both sexes.
The cheapest days to fly are usually Tuesday, Wednesday and Saturday. While your information may be only anecdotal evidence, it probably confirms what FareCompare.com's careful study of airline supply and demand confirmed in a 2011 study of U.S. carriers.
The cheapest prices of the year are for travel in February, fare experts say, and those deals usually show up in November and early December. For peak-season travel, fares start fairly high and then come down. Airlines start more-actively managing pricing on flights about three-to-four months before departure.