One tradition maintains that Sheikh Ishaaq had twin sons: Muhammad (Arap), and Ismail (Garhajis).[31] In addition, Sheikh Ishaaq had four additional sons in Yemen (Dir'an, Shareef, Yusuf and Mansur) who's descendants inhabit parts of northern Yemen, including the Khawlan district and the Ma'rib governorate.[32][33][34][35]