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as we all know Queen Marry II and King William III had 3 children (1 boy and 2 girls) their line started the Personal Union between the Holland and the UBK (United Britannic Kingdoms) so what if they hadn't had any children? or what if King William IV died before his mother and father thus leaving the Britannic thrones to a woman (his sister Princess Anne, queen-consort of Denmark and Norway) thus braking the Personal Union?