KöMaL 2010 C1018

A group of 5 little girls and 7 little boys in the kindergarten are playing at weddings. They choose a bride and groom, a registrar, two bridesmaids, one best man for the bride and one for the groom, one witness for the bride and one for the groom. Three of the girls each have a brother in the group, too, and there are no other pairs of brothers or sisters. In how many different ways can the selection be made if a sister and brother cannot play the bride and groom, and the registrar cannot be the brother or sister of either of the newly weds. (Bridesmaids are girls and best men are boys. There is no restriction on the sex of the witnesses.)