Farz Rakaat for all prayers
Asslam-o-Alaikum,
I have a confusion about Farz Rakaat of all Prayers. One of my cousin says that we only have to read the Farz of all prayers and we will be asked by Allah only about Farz and not about Sunnah and Nafal. And she don't even read Witar in Isha prayer. But I believe that Isha can not be completed with out reading Witar. As we are told that in Fajar we can't leave 2 Sunnah. In Zohar Farz Rakaat are 4 sunnah, 4 Farz, and 2 Sunnah. And we can leave 2 Nafal. Please answer this question and tell me in detail that how many Rakaat are Farz for all prayers and what Rakaat we must have to offer.
Thanks and Regards
Fi Amman-u-Allah