Convicted gang

A big family consists of 5 members : father, mother, big sis and little twin sisters.Father always goes abroad for business.One day,on the TV anchor warned about the convicted gang have just escaped,it seems that they had 6 people: 3 gals and 3 guys.That night,when 4 females were sleeping ,there was a noise.Big sis came downstairs to checkout and that noise was made by wanted gang.They had infiltrated the house to hide.The leader gang threatened to kill her if she dare to call police.She begged them to spare her family and take anything they want.All six prisoners grinned because the fun had just began