BS' and NY's inclusive fitness to date

Two females in a muriqui group have each given birth to 6 offspring. One of these "mega-moms," BS, has given birth to 5 daughters and one son. Her oldest daughter, BR, has a daughter of her own. The other mega-mom, NY, has given birth to 2 daughters and 4 sons. Using this information, answer the following questions: Which individuals represent BS' inclusive fitness? What is the difference between BS' and NY's inclusive fitness to date? What would be the difference between BS' and NY's current inclusive fitness if two of NY's sons had fathered one offspring each?