Pattern of births

My Farther is 1 or 7 children, all of his brothers and sisters (including him have at least 2, 3 or 4 children). The children that has been born in to these families have always be born in an order of alternating sex. I.e. if the first child was a boy, the second child has always been a girl and the third child was always a boy and so on. There was a total of 20 children born in this way to the 7 families without 1 exception to the rule The pattern has now continued on to the next generation and all of the children born to either my father or one of his brothers or sisters who have gone on to have children have also experienced this pattern of births without a singe exception. There are now 14 children born to 6 different sets of parents in this way.
Total votes: 21
Date submitted:Tue, 31 Jan 2012 09:39:52 +0000Coincidence ID:5907