So let's see, this half sister Bianca is in fact an accomplice to two murders by her deranged biological father, Brice who also happens to be Abbey's boss, and seems very fine with what her half sister did. And at the end of the movie they are all together by Adriana's pool drinking Champaign and giggling, and even Sophie whose dad was murdered because of Bianca's blabbering mouth eagerly suggests that auntie Adriana let auntie Bianca have her mom's old room! (shaking head in absolute bewilderment)