It is not possible to select your family but you can select your friends. What is the basis of real friendship? Longevity? Usefulness? Proximity? Discuss this and the difference between and acquaintance and a friend. How many real friends can you have?
Please use Understanding Human Communication, 13th Edition, by Ronald B. Adler, George Rodman and Athena du Pre (2017), published by Oxford University Press (ISBN: 978-0-19-029708-4). Chapters 9&10