Enigma 281: Family planning
From New Scientist #1428, 1st November 1984 [link]
Dick and Fecunda are family planning counsellors; so a bit of showing off is excusable. At any rate, the oldest of their five kids is called “Monday”, having been born on a Monday, the second is “Tuesday” (born on Tuesday), the third “Wednesday” (born on Wednesday), and so on. That makes the order of age clear enough but leaves the sexes more enigmatic.
Monday claims to be of different sex to Friday. Tuesday claims to have exactly three sisters; Friday claims to have exactly three brothers. Wednesday claims to have just one older sister and just one younger sister. Thursday claims to have a younger brother.
In fact there is at least one child of each sex. Any claims by one sex are true, whereas any by the other are false.
Can you list the sexes in the right order, starting with Monday?