He's, she's, and They's!
I remember reading a book in middle or high school (early 2000's) and I think it was called a matter of price but I could be wrong. the book starts with the oldest son returning from a trip and being sent to some kind of customs. there he meets an Ant-like alien and uses a universal translator to communicate and finish his business. Over the course of the book he and this creature become almost friends. he has a friend who was not a good person and is now in a position of power and uses that do force the protagonists parents into marrying this friend to his younger sister. there are arguments but eventually the arranged marriage takes place, though the main character and his sister are both against it happening. During the wedding and reception things go well enough but his sister tries to murder her new husband when he comes to "Fulfill his duties". she tries to escape out the window and down the side of the building but is caught. In front of all the guests her right hand is cut off as punishment and she is sentenced to die. her brother decides he has to help her and goes to the ant creature/Alien to ask for money and help when he arrives he finds his friend has been murdered by his former friend. the ant has already started the process to help and the main character smuggles his heavily drugged sister out pretending to be a cargo freighter. I think maybe I have the name wrong but does anyone have any idea what this book could be?