Overview: Sibling rivalry threatens harmonious family life as the parents of two supersized broods make wedding plans. Britain's biggest family, the Radfords (who number 16), decide to renew their vows 20 years after their first wedding. Their dream is a ceremony on the beach, but with their army of kids being the bridesmaids and pageboys, will their demands put a strain on the usual Radford peace? Roy and Emma Hann's eldest daughter Rachel is set to be the first of their 12 children to tie the knot in a Mormon church wedding in Dundee.