Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
They are bilingual. Members living in Zhob and Tank speak Pashto. However, those Living in Dera Ismail Khan and Kulachi have not retained their ancestral language and mostly speak the Derawali form of Saraiki dialect which is influenced by Pashto and Seraiki. Like other Pashtun tribes, they generally observe a pre-Islamic honor code formally known as Pashtunwali.