آل ابراھیم (Ibrahim / Abraham (AS) And His Progeny)
The rationale behind this selection has been discussed in detail in the video lectures available in the following thread. Kindly refer to those lectures. Discussion 4625
I have added some additional video lectures (seven lectures at the end) in the thread mentioned in my earlier reply (Finality of Prophethood) . These lectures address your questions in a much more detail.